Incorrect Authorization in GitLab

{
  "id": "bafe11f751813e2528481a3e83c365816e593dbdd858b12055b5a78498321f25",
  "url": "https://osv.dev/vulnerability/CVE-2023-3920",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Incorrect Authorization in GitLab",
    "summary": "An issue has been discovered in GitLab affecting all versions starting from 11.2 before 16.2.8, all versions starting from 16.3 before 16.3.5, all versions starting from 16.4 before 16.4.1. It was possible that a maintainer to create a fork relationship between existing projects contrary to the documentation.",
    "evidence": "osv:CVE-2023-3920",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-3920",
      "aliases": [
        "BIT-gitlab-2023-3920",
        "CVE-2023-3920"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/gitlab-org/gitlab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "44dbeccbe1039cb1d42d8502655ffb0bce3ae803"
                },
                {
                  "fixed": "7fc27fe692abccaed7e2e0ebfea2aadf5140593f"
                },
                {
                  "introduced": "3dfd4e0bcc7eae4330e7fed87ec74bee9a8bdf2d"
                },
                {
                  "fixed": "40d6bde8c59f78957b08b3a7cd9622a97b7af981"
                },
                {
                  "introduced": "e4c1c182610739c1b1d10a8eacbea1f5aa837ad6"
                },
                {
                  "last_affected": "e4c1c182610739c1b1d10a8eacbea1f5aa837ad6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "11.2"
                      },
                      {
                        "fixed": "16.2.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "11.2"
                      },
                      {
                        "fixed": "16.2.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "16.3.0"
                      },
                      {
                        "fixed": "16.3.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "16.3.0"
                      },
                      {
                        "fixed": "16.3.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:16.4.0:*:*:*:community:*:*:*",
                    "range": [
                      {
                        "introduced": "16.4.0"
                      },
                      {
                        "last_affected": "16.4.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:16.4.0:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "16.4.0"
                      },
                      {
                        "last_affected": "16.4.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "16.4.0",
            "v16.4.0-ee",
            "v16.3.3-ee",
            "v16.3.2-ee",
            "v16.3.0-ee"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-3920.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.906896206Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/3xxx/CVE-2023-3920.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-3920",
        "https://gitlab.com/gitlab-org/gitlab/-/issues/417481",
        "https://hackerone.com/reports/2058121"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitLab",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/3xxx/CVE-2023-3920.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-3920",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507476,
  "published_at": "2023-09-29T06:02:31.303+00:00"
}