CVE-2025-23820: Content Security Policy Pro CSRF Flaw

CVE-2025-23820 Overview

CVE-2025-23820 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Content Security Policy Pro WordPress plugin developed by thapa.laxman. This security flaw allows attackers to execute unauthorized actions by tricking authenticated administrators into performing unintended operations, potentially leading to Stored Cross-Site Scripting (XSS) as a secondary impact.

Critical Impact

Attackers can exploit this CSRF vulnerability to modify Content Security Policy configurations without authorization, potentially chaining to Stored XSS and compromising site security.

Affected Products

• Content Security Policy Pro WordPress plugin versions up to and including 1.3.5
• WordPress installations running vulnerable versions of the plugin

Discovery Timeline

• 2025-01-16 - CVE-2025-23820 published to NVD
• 2026-04-23 - Last updated in NVD database

Technical Details for CVE-2025-23820

Vulnerability Analysis

This CSRF vulnerability exists in the Content Security Policy Pro plugin due to missing or improper anti-CSRF token validation in administrative functions. The plugin fails to verify that requests to modify security policy settings originate from legitimate authenticated sessions, allowing attackers to forge malicious requests.

The vulnerability is particularly concerning because it affects a security-focused plugin designed to implement Content Security Policy headers. Successful exploitation can undermine the very security mechanisms the plugin is intended to provide, creating a chain vulnerability that leads to Stored XSS.

Root Cause

The root cause of CVE-2025-23820 is the absence of nonce verification or other CSRF protection mechanisms in the plugin's administrative request handlers. WordPress provides built-in CSRF protection through nonces (number used once), but this plugin fails to implement these security controls properly when processing form submissions or AJAX requests that modify CSP configurations.

Without proper token validation, the plugin cannot distinguish between legitimate administrator requests and forged requests initiated by malicious third-party websites.

Attack Vector

The attack vector for this vulnerability is network-based and requires user interaction. An attacker must craft a malicious webpage containing a hidden form or JavaScript that automatically submits requests to the WordPress admin panel. When an authenticated administrator visits this malicious page, the forged request is sent with their active session credentials.

The attack flow typically involves:

1. Attacker identifies a WordPress site using Content Security Policy Pro version 1.3.5 or earlier
2. Attacker crafts a malicious page with a hidden form targeting the plugin's admin endpoints
3. Attacker entices an authenticated administrator to visit the malicious page
4. The victim's browser automatically submits the forged request with valid session cookies
5. The plugin processes the request, modifying CSP settings without proper authorization
6. The modified settings can include malicious JavaScript, resulting in Stored XSS

Detection Methods for CVE-2025-23820

Indicators of Compromise

• Unexpected modifications to Content Security Policy configurations in WordPress
• Unusual admin activity logs showing CSP setting changes without legitimate administrator actions
• Presence of suspicious JavaScript or inline scripts in CSP policy configurations
• HTTP referer headers in access logs showing requests to plugin admin pages from external domains

Detection Strategies

• Monitor WordPress admin activity logs for unauthorized changes to Content Security Policy Pro settings
• Implement Web Application Firewall (WAF) rules to detect CSRF attack patterns targeting WordPress admin endpoints
• Review plugin database entries for unexpected or malicious content in CSP configuration fields
• Audit HTTP request logs for admin panel requests with suspicious or external referer headers

Monitoring Recommendations

• Enable comprehensive WordPress audit logging to track all administrative actions
• Configure alerts for any modifications to security-related plugin settings
• Implement real-time monitoring of Content Security Policy header changes on the site
• Regularly review user session activity for signs of session hijacking or unauthorized access

How to Mitigate CVE-2025-23820

Immediate Actions Required

• Update Content Security Policy Pro plugin to the latest patched version immediately
• Audit current CSP configurations for any unauthorized or malicious modifications
• Review WordPress admin access logs for suspicious activity patterns
• Consider temporarily disabling the plugin until a patched version is available if no update exists

Patch Information

Administrators should check the WordPress plugin repository for updates to Content Security Policy Pro that address CVE-2025-23820. The vulnerability affects all versions through 1.3.5, so any version newer than this should contain the security fix. For detailed vulnerability information, refer to the Patchstack Vulnerability Report.

Workarounds

• Implement additional CSRF protection at the web server or WAF level for WordPress admin endpoints
• Restrict administrative access to trusted IP addresses only to limit attack surface
• Use browser extensions that enforce strict referer policies for sensitive administrative tasks
• Consider using alternative CSP management solutions until the vulnerability is patched

# WordPress admin IP restriction example for Apache
<Directory "/var/www/html/wp-admin">
    Require ip 192.168.1.0/24
    Require ip 10.0.0.0/8
</Directory>