OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Package Subjects

{
  "id": "784cfa1e3e5fe227ce8f455e58c884a682eae3da303138af635c363efde99ec2",
  "url": "https://osv.dev/vulnerability/CVE-2026-44736",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenProject: Relations API Filter Bypasses Visibility Scope, Leaking Cross-Project Work Package Subjects",
    "summary": "OpenProject is open-source, web-based project management software. Prior to 17.4.0, the GET /api/v3/relations endpoint allows any authenticated user to retrieve relations — and the subject (title) of work packages they have no permission to view — by supplying an arbitrary work package ID in the involved, fromId, or toId filter. This bypasses the Relation.visible scope due to a flawed performance optimization in RelationQuery. This vulnerability is fixed in 17.4.0.",
    "evidence": "osv:CVE-2026-44736",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-44736",
      "aliases": [
        "CVE-2026-44736",
        "GHSA-p9gq-hrgh-2645"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/opf/openproject",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "57fb3abf08b0075149e7abe7dbf5de99e07aee06"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "17.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "17.4.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "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-2026-44736.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:45.796176929Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44736.json",
        "https://github.com/opf/openproject/security/advisories/GHSA-p9gq-hrgh-2645",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-44736"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200",
          "CWE-639",
          "CWE-836"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44736.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-44736",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 513923,
  "published_at": "2026-06-26T19:27:54.656+00:00"
}