CVE-2026-8211 — Codelibs Fess Vulnerability

title: CVE-2026-8211 - Fess JSP File Handler Code Injection
id: scw-2026-05-09-ai-1
status: experimental
level: critical
description: |
  This rule detects attempts to exploit CVE-2026-8211 by targeting the update function in Fess's JSP File Handler. The vulnerability allows for code injection via the 'content' parameter in a POST request to '/fess/app/admin/design/update'.
author: SCW Feed Engine (AI-generated)
date: 2026-05-09
references:
  - https://shimiscyberworld.com/posts/nvd-CVE-2026-8211/
tags:
  - attack.initial_access
  - attack.t1190
logsource:
    category: webserver
detection:
  selection:
      cs-method:
          - 'POST'
      cs-uri:
          - '/fess/app/admin/design/update'
      cs-uri-query|contains:
          - 'content='
  condition: selection
falsepositives:
  - Legitimate administrative activity

Source: Shimi's Cyber World · License & reuse