CVE-2026-6415 — Cross-Site Scripting (XSS)

title: WordPress ACF Font Awesome Stored XSS Attempt via JSON Update - CVE-2026-6415
id: scw-2026-05-15-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-6415 in the Advanced Custom Fields: Font Awesome WordPress plugin. This rule specifically looks for the 'update_ajax.php' endpoint being called with the 'action=update_preview' parameter, indicating a potential attempt to inject malicious JavaScript into the JSON field values. The presence of '<script>' within the query string further narrows down the detection to a likely XSS payload.
author: SCW Feed Engine (AI-generated)
date: 2026-05-15
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-6415/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/wp-admin/admin-ajax.php'
      cs-uri-query|contains:
          - 'action=update_preview'
      cs-uri-query|contains:
          - 'acf_fa_options'
      cs-uri-query|contains:
          - '{"icon": "<script>'
      cs-method:
          - 'POST'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse