Security advisory

{
  "id": "298c15d8e03c0b803e07798711cd5223de63be4d0634a8fc444d9959c6e5cd9e",
  "url": "https://osv.dev/vulnerability/CVE-2020-13270",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-13270",
    "summary": "Missing permission check on fork relation creation in GitLab CE/EE 11.3 and later through 13.0.1 allows guest users to create a fork relation on restricted public projects via API",
    "evidence": "osv:CVE-2020-13270",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-13270",
      "aliases": [
        "BIT-gitlab-2020-13270",
        "CVE-2020-13270"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/gitlab-org/gitlab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1bbe39452664021af90851aef8527ce5e850343e"
                },
                {
                  "fixed": "c970180810155248e6522a3124fab3038e2d79a3"
                },
                {
                  "fixed": "a83f3b1c8cee724f394fbf0c6872928e4f8e882b"
                },
                {
                  "introduced": "58d798bed6228196b580ae8def5d5080e5a56c73"
                },
                {
                  "fixed": "80b99e43cfcf09b3aa07546c2c3400628ad825a3"
                },
                {
                  "introduced": "ef3e35341f6a930af2d57979999b71457b9f72a4"
                },
                {
                  "fixed": "7154da26005ece7f66f4d68e22e2b933f15a5e6d"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "11.3.0"
                      },
                      {
                        "fixed": "11.9.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "11.3.0"
                      },
                      {
                        "fixed": "12.9.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "12.10.0"
                      },
                      {
                        "fixed": "12.10.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "12.10.0"
                      },
                      {
                        "fixed": "12.10.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "13.0.0"
                      },
                      {
                        "fixed": "13.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "13.0.0"
                      },
                      {
                        "fixed": "13.0.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v13.0.0-ee",
            "v12.10.6-ee",
            "v12.10.4-ee",
            "v12.10.5-ee",
            "v12.10.3-ee",
            "v12.10.1-ee",
            "v12.10.0-ee"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-13270.json"
          }
        }
      ],
      "modified": "2026-10-30T10:30:19.028886963Z",
      "provider": "osv",
      "references": [
        "https://gitlab.com/gitlab-org/cves/-/blob/master/2020/CVE-2020-13270.json",
        "https://gitlab.com/gitlab-org/gitlab/-/issues/24648",
        "https://hackerone.com/reports/419977"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-13270",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429675,
  "published_at": "2020-06-10T15:15:13.37+00:00"
}