CVE-2026-25411: Revision Manager TMC CSRF Vulnerability

CVE-2026-25411 Overview

CVE-2026-25411 is a Cross-Site Request Forgery (CSRF) vulnerability discovered in the Revision Manager TMC WordPress plugin developed by themastercut. This vulnerability allows attackers to trick authenticated users into performing unintended actions on the WordPress site by crafting malicious requests that exploit the lack of proper CSRF token validation.

CSRF vulnerabilities occur when web applications fail to verify that requests originate from legitimate user interactions. In the case of Revision Manager TMC, an attacker could create a specially crafted web page or link that, when visited by an authenticated WordPress administrator, would execute unauthorized actions within the plugin's functionality.

Critical Impact

Authenticated users may unknowingly perform unauthorized actions such as modifying revision settings or deleting content when visiting malicious pages while logged into their WordPress site.

Affected Products

• Revision Manager TMC WordPress Plugin versions up to and including 2.8.22

Discovery Timeline

• 2026-02-19 - CVE CVE-2026-25411 published to NVD
• 2026-02-19 - Last updated in NVD database

Technical Details for CVE-2026-25411

Vulnerability Analysis

The Revision Manager TMC plugin fails to implement proper Cross-Site Request Forgery protections on one or more of its administrative functions. This security flaw enables attackers to forge requests that appear to originate from authenticated users. When a logged-in administrator visits a malicious page containing the forged request, the browser automatically includes the user's session cookies, causing the WordPress site to process the request as if it were legitimate.

The vulnerability has a network-based attack vector and requires user interaction—specifically, the victim must be tricked into visiting a malicious page while authenticated to their WordPress site. While the attack complexity is low, the impact is limited to integrity violations without affecting confidentiality or availability of the system.

Root Cause

The root cause of CVE-2026-25411 is the absence or improper implementation of nonce verification in the Revision Manager TMC plugin. WordPress provides a nonce (number used once) system specifically designed to protect against CSRF attacks. When plugins fail to implement wp_verify_nonce() checks on state-changing operations, or when they improperly generate and validate these tokens, CSRF vulnerabilities emerge.

The plugin's affected functions do not adequately verify that incoming requests contain valid, unexpired nonces tied to the current user session, allowing forged requests to be processed.

Attack Vector

An attacker exploiting CVE-2026-25411 would typically follow this attack pattern:

1. The attacker identifies an unprotected action endpoint in the Revision Manager TMC plugin
2. A malicious HTML page is crafted containing a form or JavaScript that automatically submits a forged request to the vulnerable endpoint
3. The attacker distributes the malicious page via email, social media, or other channels to target WordPress administrators
4. When a logged-in administrator visits the malicious page, their browser automatically submits the forged request along with their authentication cookies
5. The WordPress site processes the request, executing the unauthorized action

The attack requires no authentication from the attacker's perspective—they simply need to lure an authenticated victim to their malicious page. For more technical details, see the Patchstack Security Vulnerability Report.

Detection Methods for CVE-2026-25411

Indicators of Compromise

• Unexpected changes to WordPress revision settings or content without corresponding administrator activity
• Web server access logs showing POST requests to Revision Manager TMC endpoints with referrers from external, untrusted domains
• User reports of unintended modifications to revision management configurations
• Audit log entries showing administrative actions performed at times when administrators were not actively working

Detection Strategies

• Monitor WordPress admin action logs for revision-related changes that occur without corresponding login activity
• Implement web application firewall (WAF) rules to detect and block CSRF attack patterns targeting WordPress plugin endpoints
• Review HTTP referrer headers in server logs for requests to plugin administrative endpoints originating from external sources
• Deploy SentinelOne Singularity to detect anomalous web application behavior and potential exploitation attempts

Monitoring Recommendations

• Enable WordPress audit logging plugins to track all administrative actions with timestamps and user context
• Configure alerting for bulk or rapid changes to revision settings that may indicate automated exploitation
• Regularly review access logs for the wp-admin directory and plugin-specific AJAX endpoints
• Monitor for outbound connections following unexpected plugin state changes that could indicate post-exploitation activity

How to Mitigate CVE-2026-25411

Immediate Actions Required

• Update the Revision Manager TMC plugin to a version newer than 2.8.22 when a patch becomes available
• Temporarily disable the Revision Manager TMC plugin if it is not critical to site operations
• Implement additional CSRF protections at the web application firewall level
• Educate WordPress administrators about the risks of clicking unknown links while logged into the admin dashboard

Patch Information

Users should monitor the WordPress plugin repository and the vendor's official channels for security updates addressing this CSRF vulnerability. The Patchstack Security Vulnerability Report provides additional context and will likely be updated when a fix is released.

Until an official patch is available, administrators should consider the workarounds listed below to reduce exposure to this vulnerability.

Workarounds

• Log out of WordPress admin sessions before browsing other websites to prevent CSRF exploitation
• Use separate browser profiles or browsers for WordPress administration and general web browsing
• Deploy a web application firewall with CSRF protection rules enabled for WordPress endpoints
• Restrict access to the WordPress admin panel to trusted IP addresses where feasible

# Example: Restrict wp-admin access by IP in .htaccess
<Files wp-login.php>
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>