CVE-2025-3869: 4stats WordPress Plugin CSRF Vulnerability

CVE-2025-3869 Overview

The 4stats plugin for WordPress contains a Cross-Site Request Forgery (CSRF) vulnerability affecting all versions up to and including 2.0.9. The flaw stems from missing or incorrect nonce validation on the stats/stats.php page. Unauthenticated attackers can update plugin settings and inject malicious web scripts by tricking a site administrator into clicking a forged link. The vulnerability is classified under [CWE-79] and combines CSRF with stored Cross-Site Scripting (XSS) impact.

Critical Impact
Successful exploitation allows attackers to inject persistent malicious JavaScript into WordPress admin contexts, enabling session theft, admin account takeover, and site defacement through a single administrator click.

Affected Products

WordPress 4stats plugin versions up to and including 2.0.9
WordPress sites with the 4stats plugin activated
Administrator sessions on affected WordPress installations

Discovery Timeline

2025-05-24 - CVE-2025-3869 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-3869

Vulnerability Analysis

The 4stats plugin exposes settings changes through the stats/stats.php administrative page without proper WordPress nonce verification. WordPress nonces are single-use tokens that validate the origin and intent of state-changing requests. When these nonces are missing or improperly validated, the plugin cannot distinguish legitimate administrator actions from requests forged by a third-party site.

Because the vulnerable endpoint accepts settings that are later rendered in administrative pages without adequate output escaping, the CSRF flaw escalates into a stored XSS condition. An attacker can craft a request that both updates plugin configuration and injects arbitrary JavaScript, which executes when an administrator subsequently loads the affected page.

Exploitation requires user interaction, so an attacker must lure an authenticated administrator into visiting a malicious page or clicking a crafted link. The attack succeeds over the network without any prior authentication on the target WordPress site.

Root Cause

The root cause is the absence or incorrect implementation of wp_verify_nonce() and check_admin_referer() calls on the settings handler in stats/stats.php. WordPress provides these primitives specifically to prevent CSRF against privileged actions, and their omission on state-changing endpoints creates a direct exploitation path. The secondary issue is insufficient sanitization of user-supplied setting values before they are stored and rendered.

Attack Vector

The attack begins with an attacker hosting a page containing an auto-submitting form or fetch request targeting the vulnerable stats/stats.php endpoint on a WordPress site running 4stats. When a logged-in administrator visits the malicious page, the browser automatically sends authenticated cookies with the forged request. The plugin processes the request as legitimate and stores the attacker-supplied payload, which executes as JavaScript in the administrator's browser on the next visit to the affected page.

No verified proof-of-concept code is available. See the Wordfence Vulnerability Report and WordPress Plugin Code Review for technical details.

Detection Methods for CVE-2025-3869

Indicators of Compromise

Unexpected <script> tags or JavaScript payloads stored in 4stats plugin settings within the WordPress wp_options table
HTTP POST requests to stats/stats.php originating from external Referer headers not matching the site's own domain
Administrator sessions initiating outbound requests to unfamiliar domains shortly after visiting the WordPress admin dashboard
New or modified administrator accounts appearing without corresponding audit log entries

Detection Strategies

Audit the 4stats plugin configuration in the WordPress database for HTML or JavaScript content in fields that should contain only plain text or numeric values
Review web server access logs for POST requests to stats/stats.php with mismatched Referer or Origin headers
Deploy a Web Application Firewall (WAF) rule that flags cross-origin state-changing requests to WordPress admin endpoints missing valid nonce parameters

Monitoring Recommendations

Enable WordPress activity logging plugins to capture setting changes and administrator actions with source IP and referer data
Monitor for anomalous JavaScript execution in the wp-admin context using browser-side Content Security Policy (CSP) violation reports
Track file integrity of plugin directories and database options tables for unauthorized modifications

How to Mitigate CVE-2025-3869

Immediate Actions Required

Deactivate the 4stats plugin on all WordPress installations until a patched version is confirmed available
Review current plugin settings for any injected script content and restore known-good values
Force password resets and session invalidation for all WordPress administrator accounts on affected sites
Apply a WAF rule blocking state-changing requests to 4stats endpoints that lack valid WordPress nonces

Patch Information

No patched version is referenced in the current NVD data. All versions up to and including 2.0.9 remain vulnerable. Site operators should monitor the official 4stats plugin page for updates and consider replacing the plugin with an actively maintained analytics alternative if a fix is not released.

Workarounds

Remove the 4stats plugin entirely and use an alternative WordPress analytics solution with active security maintenance
Restrict access to /wp-admin/ by IP allowlist to limit exposure of administrator sessions to attacker-controlled pages
Implement a strict Content Security Policy on the WordPress admin interface to block inline script execution from injected payloads
Require administrators to use separate browser profiles or sessions when performing WordPress management tasks

bash

# Example nginx configuration to restrict wp-admin access by IP
location ~ ^/wp-admin/ {
    allow 203.0.113.0/24;
    deny all;
    try_files $uri $uri/ /index.php?$args;
}