CVE-2026-91981 Vikunja before 2.6.0 User Enumeration via v2 API

Vikunja versions before 2.6.0 fail to properly validate link-share tokens in the v2 API user search endpoints. Attackers with a read-only share link can enumerate project users via the projects endpoint and confirm arbitrary usernames exist via the global search endpoint...

CVE-2026-91981

Vikunja , a self-hosted task management application, is affected by a user enumeration vulnerability in versions before 2.6.0 . The root cause is improper validation of link-share tokens in the v2 API user search endpoints. An attacker holding a read-only share link can enumerate project members ...

CVE-2026-68582 Vikunja 0.24.0 Broken Object Level Authorization via Link-Share Token

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. Fo...

CVE-2026-68582

Vikunja up to 2.3.0 contains a broken object level authorization (BOLA) 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 validating the caller’s authorization, allowing a link-share token hol...

CVE-2026-68581

Vikunja versions 0.22.0–2.3.0 are affected by an authentication bypass in API token management caused by principal-id collision: user IDs and link-share IDs share a numeric space via a generic web.Auth.GetID() interface, enabling a link-share JWT with a numeric ID equal to a target user ID to be ...