CVE-2026-2112: Dam Spam WordPress Plugin CSRF Vulnerability

CVE-2026-2112 Overview

The Dam Spam plugin for WordPress is vulnerable to Cross-Site Request Forgery (CSRF) in all versions up to, and including, 1.0.8. This vulnerability exists due to missing nonce verification on the pending comment deletion action in the cleanup page. This makes it possible for unauthenticated attackers to delete all pending comments via a forged request granted they can trick an admin into performing an action such as clicking on a link.

Critical Impact

Unauthenticated attackers can delete all pending WordPress comments by exploiting missing CSRF protection, potentially causing data loss and disruption to site moderation workflows.

Affected Products

• Dam Spam WordPress Plugin versions up to and including 1.0.8
• WordPress sites using vulnerable Dam Spam plugin versions
• WordPress installations with pending comment moderation queues

Discovery Timeline

• 2026-02-18 - CVE-2026-2112 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-2112

Vulnerability Analysis

This vulnerability is classified as CWE-352: Cross-Site Request Forgery (CSRF). The Dam Spam plugin fails to implement proper nonce verification on the pending comment deletion functionality located in settings/cleanup.php. WordPress uses nonces (number used once) as a security mechanism to protect against CSRF attacks by validating that requests originate from legitimate admin sessions. Without this verification, the plugin cannot distinguish between legitimate admin actions and malicious forged requests.

The vulnerable code path allows any attacker who can craft a malicious link or web page to trigger the deletion of all pending comments when an authenticated WordPress administrator visits the attacker-controlled content. The attack requires user interaction but no authentication from the attacker's perspective, making it exploitable through phishing or watering hole attack scenarios.

Root Cause

The root cause of this vulnerability is the absence of WordPress nonce verification in the cleanup page functionality. The settings/cleanup.php file at line 92 processes comment deletion requests without calling wp_verify_nonce() or similar validation functions. This allows the server to accept and process forged requests that appear to come from authenticated administrators.

WordPress provides built-in functions like wp_nonce_field(), wp_verify_nonce(), and check_admin_referer() specifically to prevent CSRF attacks. The failure to implement these security controls creates a direct path for exploitation.

Attack Vector

The attack vector is network-based and requires user interaction from an authenticated administrator. An attacker crafts a malicious HTML page or link containing a forged request to the vulnerable endpoint. When an administrator with an active WordPress session visits this malicious content or clicks the link, the browser automatically includes their authentication cookies with the request.

The forged request then executes the pending comment deletion action with the administrator's privileges. Since there is no nonce validation, the server cannot verify the request's legitimacy and processes the deletion. This attack typically occurs through phishing emails, malicious advertisements, or compromised websites that the administrator might visit while logged into WordPress.

For technical details on the vulnerable code, see the WordPress Plugin Source Code and the Wordfence Vulnerability Report.

Detection Methods for CVE-2026-2112

Indicators of Compromise

• Unexpected bulk deletion of pending comments without corresponding admin activity in access logs
• HTTP POST requests to the Dam Spam cleanup page from external referrers or without proper nonce parameters
• Access log entries showing cleanup.php requests with external or suspicious referer headers
• Sudden drops in pending comment counts without legitimate moderation activity

Detection Strategies

• Monitor WordPress admin activity logs for cleanup actions that lack corresponding user sessions
• Implement web application firewall (WAF) rules to detect requests to cleanup.php with missing or invalid nonce parameters
• Review HTTP referrer headers for Dam Spam cleanup requests to identify potential CSRF sources
• Deploy SentinelOne Singularity to monitor endpoint activity and detect suspicious browser behavior patterns

Monitoring Recommendations

• Enable detailed WordPress audit logging for all plugin administrative actions
• Configure alerts for bulk comment deletions exceeding normal operational thresholds
• Monitor network traffic for requests to Dam Spam endpoints from unusual sources
• Implement referrer policy checks on administrative WordPress endpoints

How to Mitigate CVE-2026-2112

Immediate Actions Required

• Update Dam Spam plugin to the latest patched version immediately
• Review pending comment queues for unexpected deletions and restore from backups if necessary
• Audit WordPress admin access logs for suspicious activity during the exposure window
• Temporarily disable the Dam Spam plugin if an update is not yet available

Patch Information

A security patch addressing this CSRF vulnerability has been released. The fix implements proper WordPress nonce verification on the pending comment deletion action. Users should update to the latest version of the Dam Spam plugin through the WordPress admin dashboard or by manually downloading from the WordPress Plugin Directory.

For details on the code changes, refer to the WordPress Change History.

Workarounds

• Restrict access to the Dam Spam cleanup page using .htaccess rules or server-level access controls
• Implement additional CSRF protection at the web server or WAF level for WordPress admin endpoints
• Limit WordPress admin sessions to trusted IP addresses to reduce the attack surface
• Train administrators to avoid clicking untrusted links while logged into WordPress

# Example .htaccess restriction for Dam Spam cleanup page
<Files "cleanup.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>