Vikunja through 2.4.0 Principal-Type Confusion via LinkSharing

{
  "id": "08385a7420eee96bf96cab36bd156ba04fcbe91c3ab59024fa90461ddb94cf88",
  "url": "https://osv.dev/vulnerability/CVE-2026-76216",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vikunja through 2.4.0 Principal-Type Confusion via LinkSharing",
    "summary": "Vikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.",
    "evidence": "osv:CVE-2026-76216",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-76216",
      "aliases": [
        "CVE-2026-76216",
        "GHSA-32r8-5843-4qw2",
        "GO-2026-6711"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/go-vikunja/vikunja",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "907850feae3866ae9b16ea1c7b84a4d77273415a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.4.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "2.4.0"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.4.0",
            "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",
            "v0.20.4",
            "v0.20.3",
            "v0.20.1",
            "v0.20.0",
            "v0.19.2",
            "v0.19.1",
            "v0.19.0",
            "v0.18.1",
            "v0.18.0",
            "v0.17.0",
            "v0.16.0",
            "v0.15.0",
            "v0.14.0",
            "v0.13",
            "v0.12",
            "v0.11",
            "v0.10",
            "v0.9",
            "v0.8",
            "v0.7",
            "v0.6",
            "v0.5",
            "v0.4",
            "v0.3",
            "v0.2",
            "v0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76216.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.168676129Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76216.json",
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-76216",
        "https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76216.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-76216",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518448,
  "published_at": "2026-08-19T14:02:01.282+00:00"
}