CVE-2025-25123: Easy Related Posts CSRF Vulnerability

CVE-2025-25123 Overview

CVE-2025-25123 is a Cross-Site Request Forgery (CSRF) vulnerability in the xdark Easy Related Posts WordPress plugin that can lead to Stored Cross-Site Scripting (XSS). This chained vulnerability allows attackers to trick authenticated administrators into unknowingly submitting malicious requests that inject persistent JavaScript code into the WordPress site. When successful, the injected script executes in the browsers of users who view affected pages, potentially leading to session hijacking, defacement, or further attacks against site visitors.

Critical Impact

This vulnerability allows attackers to chain CSRF and Stored XSS attacks to persistently compromise WordPress sites running Easy Related Posts plugin version 2.0.2 and earlier, potentially affecting all site visitors.

Affected Products

• Easy Related Posts WordPress Plugin versions up to and including 2.0.2
• WordPress installations using the vulnerable Easy Related Posts plugin
• All websites with authenticated administrators using the vulnerable plugin

Discovery Timeline

• 2025-02-07 - CVE-2025-25123 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-25123

Vulnerability Analysis

This vulnerability combines two distinct attack vectors: Cross-Site Request Forgery (CWE-352) and Stored Cross-Site Scripting. The Easy Related Posts plugin fails to implement proper CSRF protection mechanisms such as nonce verification on administrative actions. Additionally, the plugin does not adequately sanitize and escape user input before storing it in the database and rendering it on the frontend.

The attack requires social engineering to lure an authenticated administrator to visit a malicious page containing a crafted form or request. Once the CSRF attack succeeds, the malicious JavaScript payload becomes persistently stored in the WordPress database and executes whenever users view pages where the related posts functionality is rendered.

Root Cause

The root cause of this vulnerability is twofold:

1. Missing CSRF Protection: The plugin's administrative endpoints lack proper nonce verification, allowing external sites to forge requests on behalf of authenticated users.

2. Insufficient Output Encoding: User-controlled input stored through the plugin settings is not properly sanitized or escaped before being rendered in HTML output, enabling stored XSS attacks.

Attack Vector

An attacker can exploit this vulnerability through the following attack flow:

1. The attacker crafts a malicious HTML page containing a hidden form or JavaScript that automatically submits a request to the Easy Related Posts plugin's administrative endpoint
2. The attacker entices a logged-in WordPress administrator to visit the malicious page (via phishing email, malicious link, etc.)
3. The victim's browser automatically submits the forged request with the administrator's session cookies
4. The malicious JavaScript payload is stored in the plugin settings
5. When any user visits a page displaying related posts, the stored XSS payload executes in their browser context

The attack does not require user interaction beyond visiting the attacker-controlled page, and the stored nature of the XSS means the payload persists and affects all subsequent visitors to affected pages.

Detection Methods for CVE-2025-25123

Indicators of Compromise

• Unexpected or suspicious JavaScript code in plugin settings or database entries related to Easy Related Posts
• Unauthorized modifications to plugin configuration without administrator action
• Browser console errors or unexpected script execution on pages featuring related posts
• Referrer logs showing administrator visits to unknown external sites followed by plugin changes

Detection Strategies

• Monitor WordPress audit logs for changes to Easy Related Posts plugin settings
• Implement Content Security Policy (CSP) headers to detect and block inline script execution
• Regularly scan database content for malicious script tags or encoded JavaScript payloads
• Use web application firewalls (WAF) with XSS and CSRF detection rules

Monitoring Recommendations

• Enable comprehensive logging for WordPress administrative actions
• Deploy file integrity monitoring to detect unauthorized changes to plugin files
• Configure alerts for unusual patterns in plugin settings modifications
• Implement real-time security monitoring solutions that can detect stored XSS payloads

How to Mitigate CVE-2025-25123

Immediate Actions Required

• Update the Easy Related Posts plugin to the latest patched version immediately
• Review and audit current plugin settings for any unauthorized or suspicious content
• Scan the WordPress database for stored malicious JavaScript payloads
• Educate administrators about phishing and social engineering attack vectors
• Consider temporarily disabling the plugin until a patch is confirmed

Patch Information

Administrators should check for updates to the Easy Related Posts plugin through the WordPress plugin repository. For detailed vulnerability information and patch status, refer to the Patchstack WordPress Vulnerability Database.

Workarounds

• Implement server-side CSRF protection at the web server or WAF level for WordPress administrative endpoints
• Deploy Content Security Policy headers to mitigate the impact of stored XSS
• Restrict administrative access to trusted IP addresses only
• Use browser extensions that block automatic form submissions to external domains
• Consider using an alternative related posts plugin with active security maintenance

# Add Content Security Policy header in Apache .htaccess
# This helps mitigate the impact of stored XSS
Header set Content-Security-Policy "script-src 'self'; object-src 'none';"

# For Nginx, add to server block:
# add_header Content-Security-Policy "script-src 'self'; object-src 'none';";