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Atomicorp WAF Rule 399649

Rule Summary

  • Rule ID: 399649
  • Status: Active
  • Alert message: Atomicorp.com WAF Rules: CVE-2026-96649 Cross-site scripting in post_content on /wp-admin/admin-ajax.php (detectXSS)
  • Observed CWEs: None documented
  • Revision: 1
  • Rule severity: Critical (2)
  • Phase: 2 (request body)
  • Request surfaces: Request filename
  • Rule action: deny
  • HTTP status: 403
  • Public tags: CVE-2026-96649, XSS
  • Logging: log, auditlog

Description

This rule detects behavior identified by its current alert as “CVE-2026-96649 Cross-site scripting in post_content on /wp-admin/admin-ajax.php (detectXSS)” in the request filename. It evaluates during the request body phase and denies matching traffic with HTTP status 403.

CVEs Referenced by This Rule

The current ModSecurity rule metadata explicitly names the following CVEs. These references explain the rule author’s association; they do not claim that the rule is limited to these vulnerabilities or that this is an exhaustive coverage list.

CVE-2026-96649

The Frontend Post Submission Manager Lite – Frontend Posting WordPress Plugin plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via post_content Parameter (data-label DOM Sink) in all versions up to, and including, 1.3.4 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the site operator to have enabled guest post submission via the [fpsm] shortcode, which registers a publicly accessible AJAX handler gated only by a nonce emitted on every page containing the shortcode.

This is a selected list of documented research observations, not an exhaustive coverage matrix. Absence of a CVE does not imply absence of protection.

No selected related public CVE research notes are currently published.