CVE-2026-76216: Go-Vikunja Vikunja

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

Vikunja through 2.4.0 contains a principal-type confusion vulnerability where LinkSharing principals with id N are treated as user principals with users.id == N at three permission checks lacking type guards. Attackers with a link-share JWT can remove victims from teams, enumerate and delete victim bot users, or read team rosters by exploiting id collisions in the autoincrement space.

Affected products

• Go-Vikunja Vikunja: up to and including 2.4.0

Published 2026-08-19. Last modified 2026-09-16.