CVE-2025-22795: Multilang Contact Form XSS Vulnerability

CVE-2025-22795 Overview

CVE-2025-22795 is a Reflected Cross-Site Scripting (XSS) vulnerability affecting the Multilang Contact Form WordPress plugin developed by digitaldonkey. This vulnerability stems from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of a victim's browser session.

Reflected XSS vulnerabilities like this one are particularly dangerous in WordPress environments as they can be leveraged to steal session cookies, redirect users to malicious sites, or perform unauthorized actions on behalf of authenticated administrators.

Critical Impact

Attackers can craft malicious URLs that, when clicked by WordPress administrators or users, execute arbitrary JavaScript code in their browsers, potentially leading to session hijacking, credential theft, or website defacement.

Affected Products

• Multilang Contact Form plugin versions 1.5 and earlier
• WordPress sites running vulnerable versions of the multilang-contact-form plugin

Discovery Timeline

• 2025-01-15 - CVE-2025-22795 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-22795

Vulnerability Analysis

This vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The Multilang Contact Form plugin fails to properly sanitize user-supplied input before reflecting it back in the HTML response, creating an opportunity for script injection.

In a Reflected XSS attack scenario, the malicious payload is delivered through a specially crafted URL parameter. When a victim clicks the malicious link, the vulnerable plugin processes the request and reflects the unsanitized input directly into the page output, causing the injected script to execute in the victim's browser context.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and output encoding within the Multilang Contact Form plugin. User-controllable parameters are not properly sanitized before being included in the HTML response, allowing script tags and JavaScript event handlers to be injected and executed.

WordPress plugins should utilize built-in escaping functions such as esc_html(), esc_attr(), and wp_kses() to properly sanitize all user input before rendering it in web pages. The absence of these protective measures in version 1.5 and earlier creates this XSS vulnerability.

Attack Vector

The attack requires social engineering to convince a victim to click a malicious URL. An attacker crafts a URL containing JavaScript payload within a vulnerable parameter of the Multilang Contact Form plugin. When visited by a logged-in WordPress administrator, the script executes with the administrator's privileges, potentially allowing:

• Session cookie theft enabling account takeover
• Injection of malicious content into the WordPress dashboard
• Modification of site settings or content
• Creation of rogue administrator accounts
• Redirection to phishing or malware distribution sites

The vulnerability is triggered when processing form-related requests where input parameters are reflected in the response without proper encoding.

Detection Methods for CVE-2025-22795

Indicators of Compromise

• Review web server access logs for suspicious URL patterns containing encoded JavaScript, such as <script>, javascript:, or event handlers like onerror=
• Monitor for unusual HTTP requests to WordPress pages with abnormally long or encoded query parameters
• Check for unexpected outbound connections from user browsers after interacting with contact forms
• Examine any reports from users about unexpected redirects or pop-ups when using the contact form functionality

Detection Strategies

• Deploy Web Application Firewalls (WAF) with XSS detection rules to identify and block malicious payloads in URL parameters
• Implement Content Security Policy (CSP) headers to restrict script execution sources and mitigate XSS impact
• Enable WordPress security plugins that monitor for suspicious plugin behavior and XSS attempts
• Configure security logging to capture detailed request information for forensic analysis

Monitoring Recommendations

• Enable detailed access logging on web servers to capture full query strings
• Set up alerts for patterns matching common XSS payloads in request parameters
• Monitor WordPress admin action logs for any unauthorized configuration changes that might indicate post-exploitation activity
• Review plugin file integrity using WordPress security plugins to detect any unauthorized modifications

How to Mitigate CVE-2025-22795

Immediate Actions Required

• Deactivate and remove the Multilang Contact Form plugin (multilang-contact-form) if version 1.5 or earlier is installed
• Review WordPress user accounts and sessions for any signs of unauthorized access or newly created administrator accounts
• Check site content and settings for any unauthorized modifications
• Consider using an alternative contact form plugin that is actively maintained and has undergone security audits

Patch Information

At the time of this advisory, the affected versions include Multilang Contact Form version 1.5 and all prior versions. Organizations should check the Patchstack Vulnerability Report for the latest patch status and remediation guidance from the vendor.

If a patched version becomes available, update immediately through the WordPress admin dashboard or via WP-CLI.

Workarounds

• Implement a Web Application Firewall (WAF) rule to block requests containing common XSS payloads targeting the contact form endpoints
• Add Content Security Policy headers to restrict inline script execution: Content-Security-Policy: default-src 'self'; script-src 'self'
• Restrict access to the contact form functionality to authenticated users only until a patch is available
• Consider using server-level URL filtering to block requests with suspicious encoded characters in query parameters

# Example Apache .htaccess rule to block common XSS patterns
<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteCond %{QUERY_STRING} (<script|javascript:|onerror=|onload=) [NC]
    RewriteRule .* - [F,L]
</IfModule>