CVE-2025-25101: Munk Sites CSRF Vulnerability

CVE-2025-25101 Overview

CVE-2025-25101 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the MetricThemes Munk Sites WordPress plugin. This vulnerability allows attackers to perform unauthorized actions on behalf of authenticated users, potentially leading to arbitrary plugin installation on affected WordPress sites. The vulnerability stems from missing or improper nonce validation in the plugin's request handling mechanisms.

Critical Impact

This CSRF vulnerability can be chained to achieve arbitrary plugin installation, allowing attackers to install malicious plugins on WordPress sites when an authenticated administrator visits a crafted malicious page.

Affected Products

• MetricThemes Munk Sites plugin versions through 1.0.7
• WordPress installations running the affected Munk Sites plugin
• All WordPress sites with Munk Sites plugin enabled and administrator sessions active

Discovery Timeline

• 2025-02-07 - CVE-2025-25101 published to NVD
• 2025-02-07 - Last updated in NVD database

Technical Details for CVE-2025-25101

Vulnerability Analysis

This vulnerability exists in the Munk Sites WordPress plugin, a starter templates plugin developed by MetricThemes. The core issue is improper implementation of Cross-Site Request Forgery protections in the plugin's administrative functions. When a WordPress administrator is authenticated and visits a malicious web page crafted by an attacker, the vulnerability allows the attacker to execute privileged actions in the context of the administrator's session.

The attack requires user interaction—specifically, an authenticated administrator must be tricked into visiting an attacker-controlled page. However, once this condition is met, the attacker can leverage the CSRF vulnerability to install arbitrary plugins on the WordPress site without proper authorization verification.

The scope is changed in this vulnerability, meaning that successful exploitation can impact resources beyond the vulnerable component itself—in this case, the entire WordPress installation becomes compromised through the installation of potentially malicious plugins.

Root Cause

The root cause of CVE-2025-25101 is the absence of proper nonce verification in administrative AJAX handlers or form processing functions within the Munk Sites plugin. WordPress provides the wp_nonce_field() and wp_verify_nonce() functions to protect against CSRF attacks, but the vulnerable code paths in Munk Sites versions through 1.0.7 fail to properly implement these security controls.

When processing requests that trigger plugin installation functionality, the plugin does not adequately verify that the request originated from a legitimate administrative action, allowing forged requests from external sources to be processed with the privileges of the authenticated user.

Attack Vector

The attack vector for this vulnerability is network-based and requires user interaction. An attacker would typically:

1. Craft a malicious HTML page containing a hidden form or JavaScript that submits requests to the vulnerable WordPress administrative endpoints
2. Distribute the malicious page via phishing emails, compromised websites, or social engineering tactics
3. Wait for an authenticated WordPress administrator to visit the malicious page
4. The hidden request executes in the context of the administrator's authenticated session
5. The arbitrary plugin installation action is performed without the administrator's knowledge

The vulnerability enables attackers to bypass the same-origin policy protections that would normally prevent such cross-domain attacks. The attack can be fully automated through malicious JavaScript, requiring no additional interaction beyond the initial page visit.

Detection Methods for CVE-2025-25101

Indicators of Compromise

• Unexpected plugins installed on WordPress sites, particularly those not recognized or authorized by administrators
• WordPress activity logs showing plugin installation events not initiated by legitimate administrators
• HTTP access logs revealing requests to plugin installation endpoints from external referrer URLs
• Unusual administrative AJAX requests with missing or invalid nonce parameters

Detection Strategies

• Monitor WordPress administrative action logs for plugin installation events, correlating with administrator activity patterns
• Implement Web Application Firewall (WAF) rules to detect and block CSRF attack patterns targeting WordPress administrative endpoints
• Enable referrer header validation for administrative requests to identify cross-origin submissions
• Deploy endpoint detection solutions that monitor browser behavior for signs of cross-site request exploitation

Monitoring Recommendations

• Configure WordPress security plugins to alert on any new plugin installations
• Implement network traffic analysis to identify suspicious POST requests to WordPress admin-ajax.php endpoints
• Review server access logs regularly for patterns indicating CSRF exploitation attempts
• Monitor for unexpected changes to the WordPress wp-content/plugins directory

How to Mitigate CVE-2025-25101

Immediate Actions Required

• Update the Munk Sites plugin to the latest version that addresses this vulnerability
• Audit all installed WordPress plugins to identify any unauthorized installations
• Review WordPress activity logs for suspicious administrative actions
• Consider temporarily deactivating the Munk Sites plugin until a patch is applied

Patch Information

The vulnerability affects Munk Sites plugin versions through 1.0.7. Site administrators should check the Patchstack WordPress Vulnerability Report for the latest patch information and update to a version that includes proper CSRF protection.

Workarounds

• Implement additional CSRF protection at the web server or WAF level by validating referrer headers for administrative requests
• Restrict administrative access to trusted IP addresses only to limit the attack surface
• Enable multi-factor authentication for WordPress administrator accounts to add an additional security layer
• Use browser extensions or policies that prevent automatic form submissions on external sites when logged into WordPress

# WordPress configuration hardening example
# Add to wp-config.php to enforce SSL for admin
define('FORCE_SSL_ADMIN', true);

# Limit login attempts and enable additional security headers
# Add to .htaccess for Apache servers
# <IfModule mod_headers.c>
#     Header set X-Frame-Options "SAMEORIGIN"
#     Header set X-Content-Type-Options "nosniff"
#     Header set Referrer-Policy "same-origin"
# </IfModule>