Vikunja: Write-level project members can delete admin-tier link shares through an unloaded permission check

Summary A project member with Write permission can delete an admin-tier link share on that project. The deletion authorization check reads the permission from an object populated only with URL IDs, rather than from the stored share. Its zero value is Read, so the check falls through to project...

GHSA-FMMF-XQ98-G327 Vikunja: Write-level project members can delete admin-tier link shares through an unloaded permission check

Summary A project member with Write permission can delete an admin-tier link share on that project. The deletion authorization check reads the permission from an object populated only with URL IDs, rather than from the stored share. Its zero value is Read, so the check falls through to project...

Vikunja: Read-only project members can obtain any link share's access hash via the single-share read endpoint (v1 and v2) and escalate to the share's permission level

Summary A user who has only read permission on a project can call the single link-share read endpoint and receive the share's hash field — the secret credential that the anonymous POST /shares/share/auth endpoint exchanges for a link-share JWT carrying the share's permission read / read-write /...

GHSA-QFWC-VX6F-3G6G Vikunja: Read-only project members can obtain any link share's access hash via the single-share read endpoint (v1 and v2) and escalate to the share's permission level

Summary A user who has only read permission on a project can call the single link-share read endpoint and receive the share's hash field — the secret credential that the anonymous POST /shares/share/auth endpoint exchanges for a link-share JWT carrying the share's permission read / read-write /...

PT-2026-31946

Name of the Vulnerable Software and Affected Versions Vikunja versions prior to 2.3.0 Description A permission escalation issue exists in Vikunja that allows a user with Write access to a project to escalate their permissions to Admin by moving the project under a project they own. This is due to...

CVE-2026-33700 Vikunja has a Link Share Delete IDOR — Missing Project Ownership Check Allows Cross-Project Link Share Deletion

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the DELETE /api/v1/projects/:project/shares/:share endpoint does not verify that the link share belongs to the project specified in the URL. An attacker with admin access to any project can delete link shares...

CVE-2026-33700: Authorization Bypass Through User-Controlled Key

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the DELETE /api/v1/projects/:project/shares/:share endpoint does not verify that the link share belongs to the project specified in the URL. An attacker with admin access to any project can delete link shares...