CVE-2026-76216

Description

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.

CVSS Vector

References

• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-32r8-5843-4qw2
• https://www.vulncheck.com/advisories/vikunja-through-principal-type-confusion-via-linksharing