OpenProject: Improper Access Control through /api/v3/work_packages/ via PATCH parameter "fileLinks"

{
  "id": "57f4ff7c8ef1468533db7989e288ff56afab8b05e4b3f2d188e5be5df1e784d8",
  "url": "https://osv.dev/vulnerability/CVE-2026-67527",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenProject: Improper Access Control through /api/v3/work_packages/ via PATCH parameter \"fileLinks\"",
    "summary": "OpenProject is open-source, web-based project management software. Prior to 17.6.0, PATCH /api/v3/work_packages/{id} accepted _links.fileLinks and allowed authenticated users with edit_work_packages but without manage_file_links to resolve Storages::FileLink records by raw id, detach or hard-delete existing FileLinks, and re-parent FileLinks from other projects to an attacker-controlled work package, exposing origin filename, origin id, and MIME type metadata. This issue is fixed in 17.6.0.",
    "evidence": "osv:CVE-2026-67527",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-67527",
      "aliases": [
        "CVE-2026-67527",
        "GHSA-c6rc-4288-8p4f"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/opf/openproject",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "2ba1fce1196268ce5686ae308eceee744237440c"
                },
                {
                  "fixed": "db480bdeb8802e3d33e4448bb4e4b56a01de2e1f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "17.6.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "db480bdeb8802e3d33e4448bb4e4b56a01de2e1f"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "2ba1fce1196268ce5686ae308eceee744237440c"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v17.6.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "11.2.1",
            "v10.5",
            "v9.0.0-pre",
            "v5.0.4",
            "sprint/2015_04",
            "sprint/2015_03",
            "sprint/2015_02",
            "sprint/2015_01",
            "sprint/2014_18",
            "sprint/2014_16",
            "sprint/2014_13",
            "sprint/2014_12",
            "sprint/2014_11",
            "sprint/2014_10",
            "sprint/2014_09",
            "sprint/2014_08",
            "2.4.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-67527.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.558127322Z",
      "provider": "osv",
      "references": [
        "https://github.com/opf/openproject/releases/tag/v17.6.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67527.json",
        "https://github.com/opf/openproject/security/advisories/GHSA-c6rc-4288-8p4f",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-67527",
        "https://github.com/opf/openproject/commit/db480bdeb8802e3d33e4448bb4e4b56a01de2e1f",
        "https://github.com/opf/openproject/pull/23815"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/67xxx/CVE-2026-67527.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-67527",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503000,
  "published_at": "2026-07-30T19:19:25.028+00:00"
}