CVE-2026-40103: Vikunja

Medium severity, CVSS 5.4. EPSS: 0.3% chance of exploitation in the next 30 days.

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.

Affected products

• Vikunja Vikunja: before 2.3.0 (fixed in 2.3.0)

Published 2026-04-10. Last modified 2026-06-17.