CVE-2025-23713: Hack me if you can CSRF Vulnerability

CVE-2025-23713 Overview

CVE-2025-23713 is a Cross-Site Request Forgery (CSRF) vulnerability in the Hack me if you can WordPress plugin developed by artanik. The flaw affects all plugin versions up to and including 1.2. Attackers can chain the CSRF weakness with insufficient input sanitization to achieve Stored Cross-Site Scripting (XSS). Successful exploitation requires tricking an authenticated administrator into visiting an attacker-controlled page. The injected script then persists in the WordPress database and executes against any user who loads the affected page. The vulnerability is tracked under CWE-352: Cross-Site Request Forgery.

Critical Impact

A successful attack stores malicious JavaScript in the WordPress site, enabling session theft, administrative account takeover, and persistent compromise of site visitors.

Affected Products

• artanik Hack me if you can WordPress plugin (hack-me-if-you-can)
• All versions from n/a through <= 1.2
• WordPress installations using the vulnerable plugin

Discovery Timeline

• 2025-01-16 - CVE-2025-23713 published to the National Vulnerability Database (NVD)
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23713

Vulnerability Analysis

The vulnerability combines two distinct weaknesses in the hack-me-if-you-can plugin. The plugin exposes state-changing endpoints that do not validate CSRF tokens. The same endpoints accept user-supplied input that is later rendered in administrative or front-end views without proper output encoding.

An attacker crafts an HTML page containing a forged request targeting the vulnerable plugin endpoint. When an authenticated administrator visits the malicious page, the browser submits the request using the administrator's active session. The plugin processes the request and stores attacker-controlled JavaScript in the WordPress database.

Because the payload is stored, the script executes every time the affected page is rendered. This converts a one-time CSRF interaction into a persistent client-side compromise. The attack vector is network-based and requires user interaction.

Root Cause

The root cause is the absence of anti-CSRF nonce validation on state-changing requests, combined with missing sanitization of user-supplied input. WordPress provides the wp_nonce_field() and check_admin_referer() APIs for CSRF protection, and sanitize_text_field() and wp_kses() for input filtering. The plugin fails to apply these protections consistently.

Attack Vector

Exploitation requires social engineering to bring an authenticated administrator to an attacker-controlled URL. The attacker hosts a page containing a hidden form or JavaScript fetch call targeting the plugin endpoint. Upon page load, the request executes in the administrator's authenticated context. The injected XSS payload then runs in the browser of any user visiting pages where the data is displayed. Additional details are available in the Patchstack WordPress Vulnerability Report.

Detection Methods for CVE-2025-23713

Indicators of Compromise

• Unexpected <script> tags, event handlers, or encoded JavaScript payloads stored in plugin-related rows of the WordPress database
• Administrator HTTP requests to plugin endpoints lacking a valid _wpnonce parameter or with a Referer header pointing to an external domain
• New or modified WordPress administrator accounts created shortly after suspicious requests to the plugin
• Outbound browser requests from site visitors to unfamiliar domains hosting JavaScript payloads

Detection Strategies

• Inspect WordPress database tables for HTML or JavaScript content in fields belonging to the hack-me-if-you-can plugin
• Review web server access logs for POST requests to plugin endpoints originating from cross-origin referers
• Deploy a Web Application Firewall (WAF) rule set that flags requests missing CSRF nonces on administrative endpoints
• Monitor browser console errors and Content Security Policy (CSP) violation reports for unexpected inline script execution

Monitoring Recommendations

• Enable WordPress audit logging for plugin configuration changes and content updates
• Forward web server and WordPress logs to a centralized SIEM for correlation with administrator session activity
• Alert on creation of new administrator accounts or modification of user roles outside of approved maintenance windows
• Track plugin version inventory across all WordPress sites and alert when versions <= 1.2 of hack-me-if-you-can are detected

How to Mitigate CVE-2025-23713

Immediate Actions Required

• Deactivate and remove the Hack me if you can plugin from all WordPress installations until a patched release is available
• Audit existing plugin-stored content and remove any unauthorized JavaScript or HTML payloads
• Force a password reset for all WordPress administrator accounts and invalidate active sessions
• Restrict administrative access to trusted IP addresses through the web server or WAF

Patch Information

No patched version above 1.2 is referenced in the available advisory data at the time of publication. Site operators should monitor the Patchstack advisory and the plugin's WordPress.org page for an updated release.

Workarounds

• Remove the plugin entirely if administrative functionality is not essential
• Implement a strict Content Security Policy that disallows inline scripts on WordPress admin pages
• Train administrators to avoid clicking untrusted links while authenticated to the WordPress dashboard
• Use a browser session dedicated to WordPress administration to reduce CSRF attack surface

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate hack-me-if-you-can
wp plugin delete hack-me-if-you-can

# Verify plugin removal
wp plugin list --status=active | grep -i hack-me-if-you-can