Duplicate Advisory: Vikunja: Link-share principal ID collision allows cross-account API token issuance and management

{
  "id": "8be21f2211c399793bcafa02bdfda214481e16df7b372afb3875d4003bddad2c",
  "url": "https://osv.dev/vulnerability/GHSA-9jrx-vmh8-c6xw",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "Duplicate Advisory: Vikunja: Link-share principal ID collision allows cross-account API token issuance and management",
    "summary": "### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-vvcv-vpph-h844. This link is maintained to preserve external references. ### Original Description Vikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because user IDs and link-share IDs are independent numeric sequences and both resolve through a generic web.Auth.GetID() interface, a link-share JWT whose numeric ID equals a target user's ID is treated as that user by the /api/v1/tokens endpoints. An authenticated attacker can obtain a target's numeric user ID via authenticated user search, then create link shares on an attacker-writable project until the link-share sequence reaches that value, and use the resulting link-share JWT to list, create, and delete the target user's API tokens (including issuing a new token with attacker-chosen scopes under the target's permissions). Fixed in version 2.4.0.",
    "evidence": "osv:GHSA-9jrx-vmh8-c6xw",
    "products": [
      {
        "name": {
          "value": "code.vikunja.io/api",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "GHSA-9jrx-vmh8-c6xw",
      "aliases": [
        "GHSA-9jrx-vmh8-c6xw"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.22.0"
                },
                {
                  "last_affected": "2.3.0"
                }
              ]
            }
          ],
          "package": {
            "name": "code.vikunja.io/api",
            "purl": "pkg:golang/code.vikunja.io/api",
            "ecosystem": "Go"
          },
          "database_specific": {
            "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-9jrx-vmh8-c6xw/GHSA-9jrx-vmh8-c6xw.json"
          }
        }
      ],
      "modified": "2026-10-09T21:00:04.715839737Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vvcv-vpph-h844",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68581",
        "https://github.com/go-vikunja/vikunja/commit/95b7e673fb5ee407498fa4b13e8b4c57847a4a0b",
        "https://github.com/go-vikunja/vikunja/commit/e6b25bd57b537ef9a72b5acdadf446ca5ef77bfa",
        "https://www.vulncheck.com/advisories/vikunja-through-authentication-bypass-via-principal-id-collision"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "severity": "HIGH",
        "github_reviewed": true,
        "nvd_published_at": "2026-08-02T13:16:54Z",
        "github_reviewed_at": "2026-10-09T20:42:06Z"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 124130,
  "published_at": "2026-08-02T15:30:21+00:00"
}