CVE-2026-1983: WordPress SEATT Plugin CSRF Vulnerability

CVE-2026-1983 Overview

The SEATT: Simple Event Attendance plugin for WordPress contains a Cross-Site Request Forgery (CSRF) vulnerability in all versions up to, and including, 1.5.0. The vulnerability stems from missing nonce validation on the event deletion functionality, allowing unauthenticated attackers to delete arbitrary events through forged requests when they can trick an administrator into performing an action such as clicking on a malicious link.

Critical Impact

Unauthenticated attackers can delete arbitrary events via CSRF, potentially causing data loss and service disruption for WordPress sites using this event management plugin.

Affected Products

• SEATT: Simple Event Attendance WordPress Plugin versions ≤ 1.5.0
• WordPress installations with the vulnerable plugin active

Discovery Timeline

• 2026-02-14 - CVE-2026-1983 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-1983

Vulnerability Analysis

This vulnerability is classified as CWE-352 (Cross-Site Request Forgery). The root cause lies in the seatt_events_admin.php file where the event deletion functionality lacks proper nonce validation. WordPress nonces (number used once) are security tokens that help protect URLs and forms from misuse by verifying that the request originated from a legitimate administrative action.

Without nonce validation, the plugin cannot verify that a deletion request was intentionally submitted by an authenticated administrator through the WordPress admin interface. This allows attackers to craft malicious requests that, when triggered by an administrator's browser, will execute with the administrator's session credentials.

Root Cause

The vulnerable code in seatt_events_admin.php (line 23) processes event deletion requests without implementing WordPress's wp_verify_nonce() function or check_admin_referer() to validate that the request contains a valid security token. This omission means the plugin accepts any properly formatted deletion request regardless of its origin.

Attack Vector

The attack requires social engineering to succeed. An attacker would craft a malicious HTML page or link containing a hidden form or request that targets the vulnerable event deletion endpoint. When an authenticated WordPress administrator visits the attacker's page or clicks the malicious link while logged into their WordPress site, their browser automatically sends the deletion request with their valid session cookies.

The attack could be delivered through:

• Phishing emails containing malicious links
• Compromised or malicious websites that administrators might visit
• Comments or posts on the WordPress site containing hidden iframes
• Social media messages with disguised links

Since no code examples are available from verified sources, the vulnerable functionality can be understood by reviewing the plugin source code where the event deletion handler processes requests without nonce verification.

Detection Methods for CVE-2026-1983

Indicators of Compromise

• Unexpected event deletions in WordPress logs without corresponding legitimate administrative activity
• Web server access logs showing unusual requests to the plugin's admin endpoints from external referrers
• Database audit logs indicating event record deletions that don't correlate with admin session activity
• Reports from users about missing events they didn't delete

Detection Strategies

• Monitor WordPress admin action logs for event deletion activities occurring without typical administrative navigation patterns
• Implement web application firewall (WAF) rules to detect and alert on requests to plugin admin endpoints from external referrers
• Review HTTP referrer headers in web server logs for event deletion requests originating from non-WordPress domains

Monitoring Recommendations

• Enable WordPress audit logging plugins to track all administrative actions including event management
• Configure alerting for bulk or rapid event deletions that may indicate automated CSRF exploitation
• Monitor for unusual patterns in admin endpoint requests, particularly those lacking valid nonce parameters

How to Mitigate CVE-2026-1983

Immediate Actions Required

• Update the SEATT: Simple Event Attendance plugin to a patched version if available
• If no patch is available, consider temporarily deactivating the plugin until a fix is released
• Implement additional CSRF protection at the web server or WAF level
• Educate administrators about the risks of clicking unknown links while logged into WordPress

Patch Information

Review the WordPress Plugin Development tracker for updates to the plugin code. The fix should implement proper nonce validation using WordPress's wp_nonce_field() in forms and wp_verify_nonce() or check_admin_referer() in the request handler. Additional technical details are available in the Wordfence Vulnerability Analysis.

Workarounds

• Restrict access to the WordPress admin area to trusted IP addresses using .htaccess or server configuration
• Use browser extensions that prevent CSRF attacks by blocking cross-origin requests to sensitive endpoints
• Require administrators to log out of WordPress before browsing other websites
• Implement a web application firewall (WAF) with CSRF protection rules

# Apache .htaccess example to restrict admin access by IP
<Files wp-admin>
  Order Deny,Allow
  Deny from all
  Allow from 192.168.1.0/24
  Allow from YOUR_TRUSTED_IP
</Files>