CVE-2026-91980: Go-Vikunja Vikunja

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

vikunja before 2.6.0 fails to validate team access when attaching teams to projects, allowing authenticated users to enumerate all teams and members. Attackers can attach arbitrary team IDs via the project teams endpoint to retrieve complete team rosters including member names and admin flags for unauthorized teams.

Affected products

• Go-Vikunja Vikunja: before 2.6.0 (fixed in 2.6.0)

Published 2026-09-15. Last modified 2026-09-16.