CVE-2026-40201 — Cross-Site Scripting (XSS)

title: Free Tier: Stored XSS in @diplodoc/search-extension title field — CVE-2026-40201
id: scw-2026-05-01-ai-1
status: experimental
level: medium
description: |
  Detects potential exploitation of CVE-2026-40201, a stored XSS vulnerability in @diplodoc/search-extension. This rule specifically looks for requests containing '.md' file extensions and a common XSS payload within the query string, indicating an attempt to inject malicious script via the title field of a markdown file.
author: SCW Feed Engine (AI-generated)
date: 2026-05-01
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-40201/
tags:
  - attack.initial_access
  - attack.t1189
logsource:
    category: webserver
detection:
  selection:
      cs-uri|contains:
          - '/.md'
      cs-uri-query|contains:
          - '<script>alert('CVE-2026-40201')</script>'
      condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse