CVE-2026-6809 — Cross-Site Scripting (XSS)

title: WordPress Social Post Embed Plugin Stored XSS via Threads Embed Handler — CVE-2026-6809
id: scw-2026-04-28-ai-1
status: experimental
level: high
description: |
  Detects attempts to exploit CVE-2026-6809 in the WordPress Social Post Embed plugin. The vulnerability allows Stored XSS via the Threads embed handler due to insufficient sanitization of user-supplied URLs. This rule specifically looks for requests targeting the plugin's embed handler with potential script injection in the query parameters.
author: SCW Feed Engine (AI-generated)
date: 2026-04-28
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-6809/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/wp-content/plugins/social-post-embed/'
      cs-uri-query|contains:
          - 'threads_embed_handler'
      cs-uri-query|contains:
          - '<script>'
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse