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Atomicorp WAF Rule 399284

Rule Summary

  • Rule ID: 399284
  • Status: Active
  • Alert message: Atomicorp.com WAF Rules: CVE-2026-84281 Cross-site scripting in productTitle 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-2026-84281, XSS
  • Logging: log, auditlog

Description

This rule detects behavior identified by its current alert as “CVE-2026-84281 Cross-site scripting in productTitle 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-2026-84281

The Fancy Product Designer plugin for WordPress is vulnerable to Stored Cross-Site Scripting via ‘productTitle’ in ‘_fpd_data’ Order Item Meta in all versions up to, and including, 6.5.2 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. The fpd_save_order AJAX action is registered for unauthenticated users via wp_ajax_nopriv_fpd_save_order with no nonce or capability check, and the strip_tags() sanitization applied at save time is bypassed by submitting JSON unicode escape sequences (e.g. \u003c, \u003e), which json_decode() silently converts back to literal angle brackets when the order is rendered in the admin view.

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.