CVE-2026-33473

Vikunja is an open-source self-hosted task management platform. Starting in version 0.13 and prior to version 2.2.1, any user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window. Version 2.2.1 patches the issue...

CVE-2026-33473

Vikunja (Vikunja) TOTP reuse flaw: 2FA TOTPs can be accepted for multiple sessions if the same timestamped code is reused within the 30‑second window. Root cause is in the TOTP validation path (ValidateTOTPPasscode) which fetches the user’s TOTP secret and validates the provided code, allowing re...

GHSA-P747-QC5P-773R Vikunja has TOTP Reuse During Validity Window

Summary Any user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window. Details The below code is called when a user that has 2FA is authenticating to the application. Once they submit a valid username-password-totp combination, the user gets authenticated...