CVE-2024-54404: MDC Comment Toolbar CSRF Vulnerability

CVE-2024-54404 Overview

CVE-2024-54404 is a Cross-Site Request Forgery (CSRF) vulnerability in the Nazmul Ahsan MDC Comment Toolbar plugin for WordPress. The flaw enables stored Cross-Site Scripting (XSS) through a forged request, affecting all versions of mdc-comment-toolbar up to and including version 1.1. An attacker can craft a malicious page that, when visited by an authenticated administrator, triggers a state-changing request and persists attacker-controlled script content in the site. The injected payload then executes in the browser of any visitor or administrator who loads the affected page.

Critical Impact
A successful attack chains CSRF [CWE-352] with stored XSS, allowing unauthenticated attackers to execute arbitrary JavaScript in privileged user sessions through social engineering.

Affected Products

Nazmul Ahsan MDC Comment Toolbar plugin for WordPress
All versions from n/a through 1.1
WordPress sites with the mdc-comment-toolbar plugin installed and active

Discovery Timeline

2024-12-16 - CVE-2024-54404 published to the National Vulnerability Database
2026-04-23 - Last updated in NVD database

Technical Details for CVE-2024-54404

Vulnerability Analysis

The MDC Comment Toolbar plugin exposes administrative actions without enforcing anti-CSRF protections. Sensitive endpoints accept POST requests without validating a WordPress nonce or verifying request origin. An attacker who lures an authenticated administrator to a malicious page can submit a request that writes attacker-controlled markup into plugin settings or comment toolbar data. Because the stored input is not sanitized or output-encoded, the payload renders as executable JavaScript whenever the affected page loads.

The vulnerability requires user interaction, as the victim must visit the attacker-controlled page while authenticated. Once executed, the stored script runs in the security context of the WordPress site, granting access to session cookies, the REST API, and any administrative function available to the victim.

Root Cause

The root cause is a missing CSRF token check on plugin form submission handlers, classified under [CWE-352]. The plugin does not call wp_verify_nonce() or equivalent validation before persisting submitted data. A secondary defect, insufficient output encoding, converts the CSRF condition into a stored XSS sink.

Attack Vector

The attack proceeds in three stages. First, the attacker hosts a page containing an auto-submitting HTML form or fetch() request targeting the vulnerable plugin endpoint on the victim's WordPress site. Second, an authenticated administrator visits the attacker page, and the browser submits the forged request using the active session cookie. Third, the injected payload is stored by the plugin and rendered to subsequent visitors, completing the stored XSS chain. Refer to the Patchstack Vulnerability Report for additional technical context.

Detection Methods for CVE-2024-54404

Indicators of Compromise

Unexpected <script> tags, event handlers, or obfuscated JavaScript stored within MDC Comment Toolbar plugin settings or rendered output
WordPress administrator accounts created or modified shortly after an admin loaded an external page
Outbound requests from admin browsers to unknown domains during normal WordPress administration sessions
Web server logs showing POST requests to mdc-comment-toolbar endpoints with Referer headers pointing to untrusted origins

Detection Strategies

Audit the WordPress database for plugin option values containing HTML or JavaScript markup that should not be present in toolbar configuration fields
Monitor admin-area HTTP requests for missing or invalid _wpnonce parameters on plugin write operations
Deploy a Web Application Firewall (WAF) rule that flags cross-origin POST requests to /wp-admin/admin.php and /wp-admin/admin-post.php targeting plugin actions

Monitoring Recommendations

Log all administrative changes to plugin settings and forward events to a centralized SIEM for correlation
Track browser telemetry for administrators, including outbound DOM-initiated requests from /wp-admin/ pages
Alert on new or modified WordPress users, roles, and capability changes that follow plugin setting writes

How to Mitigate CVE-2024-54404

Immediate Actions Required

Deactivate and remove the MDC Comment Toolbar plugin until a fixed version is confirmed available from the vendor
Review plugin configuration entries and stored comment toolbar data for injected scripts, and remove any unauthorized content
Rotate WordPress administrator passwords and invalidate active sessions if compromise is suspected
Restrict administrative access to trusted IP ranges and require administrators to use separate browser profiles for /wp-admin/ activity

Patch Information

No vendor patch is referenced in the NVD entry at the time of publication. Versions through 1.1 are affected, and no fixed release is identified in the available advisory data. Monitor the Patchstack Vulnerability Report and the WordPress plugin repository for an updated release.

Workarounds

Remove the mdc-comment-toolbar plugin directory from wp-content/plugins/ to fully disable the vulnerable code path
Apply a virtual patch via a WAF that enforces a valid Referer and Origin header on POST requests to plugin endpoints
Enable WordPress two-factor authentication for all administrator accounts to reduce the impact of session abuse
Use a content security policy (CSP) that blocks inline scripts in the WordPress admin and front-end where feasible

bash

# Remove the vulnerable plugin from the WordPress installation
wp plugin deactivate mdc-comment-toolbar
wp plugin delete mdc-comment-toolbar

# Search the database for suspicious stored payloads in plugin options
wp db query "SELECT option_name, option_value FROM wp_options \
  WHERE option_name LIKE '%mdc_comment_toolbar%' \
  AND (option_value LIKE '%<script%' OR option_value LIKE '%onerror=%');"