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 WordPress plugin "Hack me if you can" (developed by artanik) that enables attackers to perform Stored Cross-Site Scripting (XSS) attacks. This chained vulnerability allows malicious actors to trick authenticated users into unknowingly submitting requests that inject persistent malicious scripts into the WordPress site.

Critical Impact

Attackers can leverage this CSRF-to-Stored XSS chain to execute arbitrary JavaScript in the browsers of site visitors and administrators, potentially leading to session hijacking, credential theft, and complete site compromise.

Affected Products

• Hack me if you can WordPress Plugin version 1.2 and earlier
• All WordPress installations running the vulnerable plugin versions

Discovery Timeline

• 2025-01-16 - CVE-2025-23713 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23713

Vulnerability Analysis

This vulnerability represents a dangerous chaining of two web application security flaws: Cross-Site Request Forgery (CSRF) and Stored Cross-Site Scripting (XSS). The plugin fails to implement proper CSRF token validation on forms that accept user input, which is then stored and rendered without adequate output sanitization.

When a victim with sufficient privileges visits a malicious page while authenticated to the WordPress site, the attacker can forge requests on their behalf. These requests can inject malicious JavaScript payloads that become persistently stored in the database. Subsequently, when any user views the affected content, the malicious script executes in their browser context.

The network-based attack vector with low complexity makes this vulnerability accessible to attackers with moderate technical skills. While user interaction is required (the victim must visit a malicious page), the changed scope indicates that the vulnerability can impact resources beyond the vulnerable component itself.

Root Cause

The root cause of this vulnerability is twofold:

1. Missing CSRF Protection: The plugin does not implement WordPress nonce verification (wp_verify_nonce()) on state-changing requests, allowing attackers to craft malicious requests that will be executed by authenticated users.

2. Insufficient Input Sanitization: User-supplied input is stored in the database and later rendered in the browser without proper escaping using functions like esc_html(), esc_attr(), or wp_kses().

Attack Vector

The attack follows a multi-stage exploitation pattern:

1. Reconnaissance: The attacker identifies a WordPress site running the vulnerable "Hack me if you can" plugin version 1.2 or earlier.

2. Payload Crafting: The attacker creates a malicious HTML page containing a hidden form that targets the vulnerable plugin endpoint with an XSS payload.

3. Social Engineering: The attacker tricks an authenticated WordPress administrator into visiting the malicious page (via phishing, malicious ads, or compromised legitimate sites).

4. CSRF Exploitation: The victim's browser automatically submits the forged request, injecting the malicious script into the WordPress database.

5. Stored XSS Execution: When any user views the affected page, the stored malicious JavaScript executes, potentially stealing cookies, session tokens, or performing actions on behalf of the user.

The attack typically involves crafting a hidden form that auto-submits via JavaScript, targeting the plugin's vulnerable form handler with a payload such as <script> tags or event handlers.

Detection Methods for CVE-2025-23713

Indicators of Compromise

• Unexpected or unfamiliar JavaScript code in plugin-related database entries
• Suspicious <script> tags or event handlers (e.g., onerror, onload) in stored content
• Browser console errors indicating blocked XSS attempts (if Content Security Policy is enabled)
• Unusual outbound connections from visitor browsers to unknown domains

Detection Strategies

• Review WordPress database tables associated with the "Hack me if you can" plugin for suspicious HTML or JavaScript content
• Implement Web Application Firewall (WAF) rules to detect and block CSRF and XSS attack patterns
• Monitor server access logs for unusual POST requests to plugin endpoints from external referrers
• Enable Content Security Policy (CSP) headers and monitor violation reports

Monitoring Recommendations

• Deploy SentinelOne Singularity to monitor WordPress installations for suspicious script execution and file modifications
• Configure real-time alerting for database modifications containing script tags or JavaScript event handlers
• Implement integrity monitoring on WordPress plugin files to detect unauthorized modifications
• Review HTTP referrer headers in logs to identify requests originating from external, potentially malicious domains

How to Mitigate CVE-2025-23713

Immediate Actions Required

• Deactivate and remove the "Hack me if you can" plugin immediately if running version 1.2 or earlier
• Audit the WordPress database for any stored XSS payloads that may have been injected
• Review user accounts for any unauthorized administrative users or privilege escalations
• Clear browser caches and sessions for all administrative users

Patch Information

As of the last update, users should check the Patchstack WordPress Vulnerability Report for the latest patch status and remediation guidance. If no patch is available, removing the plugin entirely is strongly recommended.

Workarounds

• Remove or deactivate the "Hack me if you can" plugin until a patched version is released
• Implement a Web Application Firewall (WAF) with rules to block CSRF and XSS attack patterns
• Add Content Security Policy (CSP) headers to restrict inline script execution and mitigate XSS impact
• Limit administrative access to trusted IP addresses to reduce the attack surface for CSRF exploitation

If the plugin functionality is required, consider implementing custom CSRF protection by adding WordPress nonce verification to any custom forms or AJAX handlers that interact with the plugin.