CVE-2025-11727: WordPress Codisto Plugin XSS Vulnerability

CVE-2025-11727 Overview

The Omnichannel for WooCommerce: Google, Amazon, eBay & Walmart Integration – Powered by Codisto plugin for WordPress contains a Stored Cross-Site Scripting (XSS) vulnerability in the sync() function. This security flaw affects all versions up to and including 1.3.65 due to insufficient input sanitization and output escaping. The vulnerability allows unauthenticated attackers to inject arbitrary web scripts into pages, which execute whenever any user accesses an injected page.

Critical Impact

Unauthenticated attackers can inject persistent malicious scripts that execute in the context of victim browsers, potentially leading to session hijacking, administrative account compromise, and complete WordPress site takeover.

Affected Products

• Omnichannel for WooCommerce: Google, Amazon, eBay & Walmart Integration – Powered by Codisto plugin versions ≤ 1.3.65
• WordPress installations running vulnerable versions of the Codisto Connect plugin
• WooCommerce stores utilizing the affected plugin for marketplace integration

Discovery Timeline

• 2025-12-04 - CVE-2025-11727 published to NVD
• 2025-12-04 - Last updated in NVD database

Technical Details for CVE-2025-11727

Vulnerability Analysis

This Stored Cross-Site Scripting vulnerability exists within the sync() function of the Codisto Connect plugin. The vulnerability stems from a failure to properly sanitize user-supplied input before storing it in the database and inadequate output escaping when rendering this data on WordPress pages. Because the malicious payload is stored persistently, it affects all users who view the compromised page, making this a particularly dangerous variant of XSS.

The vulnerability is accessible without authentication, dramatically increasing the attack surface. An attacker can exploit this flaw remotely over the network without requiring any special privileges or user interaction for the initial injection. The scope is changed, meaning the vulnerable component impacts resources beyond its security scope—in this case, allowing attacks against other users viewing the affected pages.

Root Cause

The root cause is CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-Site Scripting). The sync() function within connect.php fails to implement adequate input validation and output encoding. Specifically, user-controllable data is processed without sanitizing special characters such as <, >, ", ', and / that could be interpreted as HTML or JavaScript. When this unsanitized data is subsequently rendered on WordPress pages, the browser executes the injected script as legitimate code.

Multiple code locations within connect.php are affected, including lines 2101, 2117, 3063, 3248, and 3249, as documented in the WordPress plugin repository.

Attack Vector

The attack is network-based and requires no authentication, making it highly accessible to threat actors. An attacker crafts a malicious request to the vulnerable sync() function containing JavaScript payloads. The plugin stores this unsanitized input in the WordPress database. When an administrator or site visitor loads a page that displays this data, the malicious script executes in their browser context.

The vulnerability mechanism involves the lack of proper sanitization functions such as wp_kses(), esc_html(), or esc_attr() on user input before storage and display. Attackers can leverage this to steal session cookies, perform actions as the victim user, redirect users to phishing sites, or inject cryptocurrency miners. For more technical details, refer to the Wordfence Vulnerability Report and the relevant WordPress Plugin Code Snippets.

Detection Methods for CVE-2025-11727

Indicators of Compromise

• Unexpected JavaScript code or <script> tags present in database entries related to the Codisto plugin synchronization data
• Web server logs showing unusual requests to the plugin's sync endpoint containing encoded JavaScript or HTML entities
• Browser console errors or network requests to unknown external domains when viewing WooCommerce or Codisto-related pages
• User reports of unexpected pop-ups, redirects, or behavior when accessing the WordPress admin panel or storefront

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block XSS payloads in requests targeting /wp-content/plugins/codistoconnect/ endpoints
• Deploy file integrity monitoring on the connect.php file to detect any unauthorized modifications
• Configure server-side logging to capture all requests to the sync function endpoint with full parameter logging
• Use browser-based Content Security Policy (CSP) violation reporting to identify script execution from unexpected sources

Monitoring Recommendations

• Enable verbose logging for the WordPress REST API and plugin-related endpoints
• Monitor database tables associated with the Codisto plugin for entries containing suspicious HTML or JavaScript content
• Implement real-time alerting for HTTP requests containing common XSS patterns such as <script>, javascript:, or event handlers like onerror, onload
• Review WordPress user activity logs for unexpected administrative actions that could indicate session hijacking

How to Mitigate CVE-2025-11727

Immediate Actions Required

• Update the Omnichannel for WooCommerce plugin to a version newer than 1.3.65 immediately when a patch becomes available
• Temporarily deactivate the Codisto Connect plugin if a patched version is not yet available and marketplace integration can be paused
• Audit the WordPress database for any stored malicious scripts injected via the sync() function and sanitize affected records
• Force logout all WordPress administrator sessions and require password resets for privileged accounts as a precaution

Patch Information

Organizations should monitor the WordPress plugin repository for an updated version of the Omnichannel for WooCommerce plugin that addresses this vulnerability. The patched version should implement proper input sanitization using WordPress security functions like sanitize_text_field() and output escaping with esc_html() or wp_kses() in the affected sync() function. Refer to the Wordfence Vulnerability Report for updates on patch availability.

Workarounds

• Implement a Web Application Firewall (WAF) rule to filter incoming requests containing XSS payloads targeting the Codisto plugin endpoints
• Restrict access to the WordPress admin area and plugin endpoints by IP address using .htaccess or server-level firewall rules
• Deploy a Content Security Policy (CSP) header to prevent inline script execution and restrict script sources to trusted domains
• Consider using a security plugin such as Wordfence to enable virtual patching until an official fix is released

# Example .htaccess rules to restrict access to the vulnerable plugin
<IfModule mod_rewrite.c>
    RewriteEngine On
    # Block external access to Codisto plugin endpoints
    RewriteCond %{REQUEST_URI} ^/wp-content/plugins/codistoconnect/ [NC]
    RewriteCond %{REMOTE_ADDR} !^192\.168\.1\. [NC]
    RewriteRule .* - [F,L]
</IfModule>

# Add Content Security Policy header
<IfModule mod_headers.c>
    Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none';"
</IfModule>