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CVE-2026-68582 – Broken Object Level Authorization (Cross-Tenant Data Disclosure) – Vikunja 0.24.0 t

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Summary

CVE-2026-68582 is a Broken Object Level Authorization (BOLA) vulnerability in Vikunja (go-vikunja), the open-source task and project management application. A holder of any link-share token can read kanban view data belonging to projects outside their authorized scope, resulting in cross-tenant metadata and user-information disclosure. It affects Vikunja versions 0.24.0 through 2.3.0 and is rated Critical.

Technical details

  • Root cause: The TaskCollection.ReadAll handler loads a kanban view directly from URL parameters without confirming the caller is authorized for that view. For link-share tokens, the query is pinned to the share’s project, but the requested view is not re-validated against that same project scope (CWE-639, Authorization Bypass Through User-Controlled Key).
  • Trigger conditions: An attacker in possession of any valid project link-share token requests foreign views, e.g. GET /api/v1/projects/{projectID}/views/{viewID}/tasks, substituting project and view IDs they do not own.
  • Attack vector: Network. Exploitation requires only a link-share token; no account authentication or user interaction is needed.
  • Impact: Unauthorized read access to kanban bucket records across tenant boundaries, disclosing bucket titles and creator user objects (usernames, names, and user IDs). Sequential ID testing (200 vs. 404 responses) yields a project/view existence oracle enabling instance-wide enumeration. Task contents within other projects remain protected.

Affected software

  • Vikunja (go-vikunja) versions >= 0.24.0 and <= 2.3.0

Severity

  • CVSS v4.0 base score: 9.3 (Critical) — CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H
  • CVSS v3.1 base score: 6.5 (Medium) — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade to Vikunja 2.4.0, which enforces that link-share tokens can only resolve views belonging to their authorized project.
  • If no patch: Restrict or revoke project link-share tokens, and limit network exposure of the Vikunja API to trusted clients until the upgrade can be applied.

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