CVE-2026-4811 — Cross-Site Scripting (XSS)

title: WordPress WPB Floating Menu Stored XSS via Icon CSS Class - CVE-2026-4811
id: scw-2026-05-21-ai-1
status: experimental
level: high
description: |
  This rule detects attempts to exploit CVE-2026-4811 in the WPB Floating Menu & Categories for WordPress plugin. It specifically looks for the 'wpb_fm_save_categories' AJAX action combined with the presence of 'icon_css_class' parameter containing script tags, indicating a Stored Cross-Site Scripting attempt.
author: SCW Feed Engine (AI-generated)
date: 2026-05-21
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-4811/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/wp-admin/admin-ajax.php'
      cs-uri-query|contains:
          - 'action=wpb_fm_save_categories'
      cs-uri-query|contains:
          - 'icon_css_class='
      cs-uri-query|contains:
          - '<script>'
      cs-uri-query|contains:
          - '</script>'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse