CVE-2026-68581 – Vikunja 0.22.0 through 2.3.0 Authentication Bypass via Principal ID Collision

CVE ID :CVE-2026-68581

Published : Aug. 2, 2026, 1:16 p.m. | 35 minutes ago

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.

Severity: 8.6 | HIGH

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