Vikunja: Project duplication bypasses write-permission check on the target parent project

{
  "id": "6d49edaf6a85d3e01e9a7a77689b2be09e68093f1d0a15b875fe92b9716523af",
  "url": "https://osv.dev/vulnerability/CVE-2026-54766",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vikunja: Project duplication bypasses write-permission check on the target parent project",
    "summary": "Vikunja is an open-source self-hosted task management platform. From 0.21.0 until 2.4.0, the project duplication operation in pkg/models/project_duplicate.go allows an authenticated user who can read a source project to place its duplicate beneath an arbitrary target parent project. ProjectDuplicate.CanCreate calls parent.CanCreate on an unhydrated Project containing only the body supplied parent_project_id instead of calling parent.CanWrite, so the target parent write-permission check is skipped. The ordinary project creation path enforces that permission, but PUT /api/v1/projects/{project}/duplicate does not, allowing attacker-owned content to be injected into another user or team project hierarchy. This issue is fixed in version 2.4.0.",
    "evidence": "osv:CVE-2026-54766",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-54766",
      "aliases": [
        "CVE-2026-54766",
        "GHSA-f27p-pw2p-9pr4",
        "GO-2026-6311"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-vikunja/vikunja",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e5cd4897d6be52c5bacb39a4ddae322921bfc0ee"
                },
                {
                  "fixed": "907850feae3866ae9b16ea1c7b84a4d77273415a"
                },
                {
                  "fixed": "d911caaa11c748c3abc6b98b3189afea2677bcb0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0.21.0"
                      },
                      {
                        "fixed": "2.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "d911caaa11c748c3abc6b98b3189afea2677bcb0"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "907850feae3866ae9b16ea1c7b84a4d77273415a"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.4.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.3.0",
            "v2.2.2",
            "v2.2.1",
            "v2.2.0",
            "v2.1.0",
            "v2.0.0",
            "v1.1.0",
            "v1.0.0",
            "v1.0.0-rc4",
            "v1.0.0-rc3",
            "v1.0.0-rc2",
            "v1.0.0-rc1",
            "v1.0.0-rc0",
            "v0.24.1",
            "v0.23.0",
            "v0.22.1",
            "v0.22.0",
            "v0.21.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-54766.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.449634563Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54766.json",
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f27p-pw2p-9pr4",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-54766",
        "https://github.com/go-vikunja/vikunja/commit/d911caaa11c748c3abc6b98b3189afea2677bcb0",
        "https://github.com/go-vikunja/vikunja/pull/3239"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-285",
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54766.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-54766",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493866,
  "published_at": "2026-08-28T16:36:57.857+00:00"
}