CVE-2026-91985

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate...

CVE-2026-91981

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-2026-91985 Vikunja before 2.6.0 Privilege Escalation via Link Share Hash

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate...

CVE-2026-91985

Vikunja before 2.6.0 contains an access-control flaw in its single-share read endpoints: the link-share hash field is not properly restricted, allowing read-only members to obtain the share's secret credential. An attacker can then exchange that hash for a link-share JWT at the share's permission...

CVE-2026-91985 Vikunja before 2.6.0 Privilege Escalation via Link Share Hash

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate...

EUVD-2026-78656

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate...

CVE-2026-91985 Vikunja before 2.6.0 Privilege Escalation via Link Share Hash

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate...

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 ...

EUVD-2026-78652

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...

PT-2026-92099

Name of the Vulnerable Software and Affected Versions Vikunja versions prior to 2.6.0 Description Insufficient access restriction to the link-share hash field in single-share read endpoints allows read-only members to obtain the secret credential of a share. An attacker can use this disclosed has...

CVE-2026-91981: Exposure of Sensitive Information to an Unauthorized Actor

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...

PT-2026-92095

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-2026-91985: Exposure of Sensitive Information to an Unauthorized Actor

Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate...

CVE-2026-68581

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...

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-2026-68582 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-2026-68581 Vikunja 0.22.0 through 2.3.0 Authentication Bypass via Principal ID Collision

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...

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 ...