Authorization Bypass Through User-Controlled Key in GitLab

{
  "id": "eb7f3304d8591dbcdd6d50debd960f8720a27f8460666026fd2d409a9239ec41",
  "url": "https://osv.dev/vulnerability/CVE-2026-4398",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Authorization Bypass Through User-Controlled Key in GitLab",
    "summary": "GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user could have assigned compliance frameworks from namespaces they were not authorized to access to their own project, due to missing namespace validation on self-managed instances.",
    "evidence": "osv:CVE-2026-4398",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-4398",
      "aliases": [
        "BIT-gitlab-2026-4398",
        "CVE-2026-4398"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://gitlab.com/gitlab-org/gitlab",
              "type": "GIT",
              "events": [
                {
                  "introduced": "94282cd9b41643ecd8a82da6cf46834cd9609afe"
                },
                {
                  "fixed": "23b2045861177bbf757b871b586c9484417efd4b"
                },
                {
                  "introduced": "68485a1eb627c9a992f266263157327649822db3"
                },
                {
                  "fixed": "9ec1fc106b0569dae500ceedba261cf24235d37f"
                },
                {
                  "introduced": "8f83039bebbbb61d3b7b8b7e2342d1deec1e14c6"
                },
                {
                  "last_affected": "8f83039bebbbb61d3b7b8b7e2342d1deec1e14c6"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "18.3.0"
                      },
                      {
                        "fixed": "19.1.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:*:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "19.2.0"
                      },
                      {
                        "fixed": "19.2.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:gitlab:gitlab:19.3.0:*:*:*:enterprise:*:*:*",
                    "range": [
                      {
                        "introduced": "19.3.0"
                      },
                      {
                        "last_affected": "19.3.0"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "19.3.0",
            "v19.3.0-ee",
            "v19.2.0-ee"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4398.json"
          }
        }
      ],
      "modified": "2026-10-30T10:30:29.697743338Z",
      "provider": "osv",
      "references": [
        "https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/",
        "https://gitlab.com/gitlab-org/gitlab/-/work_items/600360",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4398.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-4398",
        "https://hackerone.com/reports/3549150"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "GitLab",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "18.3"
                  },
                  {
                    "fixed": "19.1.7"
                  },
                  {
                    "introduced": "19.2"
                  },
                  {
                    "fixed": "19.2.5"
                  },
                  {
                    "introduced": "19.3"
                  },
                  {
                    "fixed": "19.3.1"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StandardRange"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "18.3"
                  },
                  {
                    "fixed": "19.1.7"
                  },
                  {
                    "introduced": "19.2"
                  },
                  {
                    "fixed": "19.2.5"
                  },
                  {
                    "introduced": "19.3"
                  },
                  {
                    "fixed": "19.3.1"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4398.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-4398",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513813,
  "published_at": "2026-04-08T23:16:59.907+00:00"
}