Vikunja is an open-source self-hosted task management platform. Prior to version 2.0.0, the application allows users to set weak passwords (e.g., 1234, password) without enforcing minimum strength requirements. Additionally, active sessions remain valid after a user changes their password. An attacker who compromises an account (via brute-force or credential stuffing) can maintain persistent access even after the victim resets their password. Version 2.0.0 contains a fix.
https://vikunja.io/changelog/vikunja-v2.0.0-was-released
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-3ccg-x393-96v8