Duplicate Advisory: Vikunja: Link-share token reads any tenant's kanban buckets and enumerates usernames/IDs instance-wide (BOLA)

{
  "id": "c5d159ed3fb1e464f83a916473abed87fb57ca029ea0eb8e61ccf54b2c08cea1",
  "url": "https://osv.dev/vulnerability/GHSA-p4r4-8cxw-pjx7",
  "method": "structured",
  "payload": {
    "kind": "withdrawal",
    "title": "Duplicate Advisory: Vikunja: Link-share token reads any tenant's kanban buckets and enumerates usernames/IDs instance-wide (BOLA)",
    "summary": "### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-rj9j-8772-4h6c. This link is maintained to preserve external references. ### Original Description Vikunja versions >= 0.24.0 and <= 2.3.0 contain a broken object level authorization (BOLA) vulnerability in the task-collection endpoint (GET /api/v1/projects/{project}/views/{view}/tasks). The endpoint loads the requested project view from the URL path without verifying the caller is authorized for it. For a link-share token holder, the task scope is pinned to the share's own project, but the view is taken from the attacker-controlled path and never re-validated. As a result, a holder of any project share link can read any other tenant's kanban bucket records — bucket titles and the full created_by user object (username, name, id) — for every view in the instance. The same missing pre-authorization view load also creates a project/view-ID existence oracle (404 vs. non-404) usable by link shares and ordinary authenticated users. Task contents remain constrained to the share's own project and are not disclosed. Fixed in 2.4.0.",
    "evidence": "osv:GHSA-p4r4-8cxw-pjx7",
    "products": [
      {
        "name": {
          "value": "code.vikunja.io/api",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "GHSA-p4r4-8cxw-pjx7",
      "aliases": [
        "GHSA-p4r4-8cxw-pjx7"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        },
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/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": "0.24.0"
                },
                {
                  "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-p4r4-8cxw-pjx7/GHSA-p4r4-8cxw-pjx7.json"
          }
        }
      ],
      "modified": "2026-10-09T21:00:05.418632210Z",
      "provider": "osv",
      "references": [
        "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-rj9j-8772-4h6c",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68582",
        "https://www.vulncheck.com/advisories/vikunja-broken-object-level-authorization-via-link-share-token"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-639"
        ],
        "severity": "CRITICAL",
        "github_reviewed": true,
        "nvd_published_at": "2026-08-02T13:16:54Z",
        "github_reviewed_at": "2026-10-09T20:42:24Z"
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 124132,
  "published_at": "2026-08-02T15:30:21+00:00"
}