CVE-2026-33473: Vikunja has TOTP Reuse During Validity Window

Severity: medium (CVSS 5.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-03-24 · updated 2026-06-17
Weakness: CWE-287

Description

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.

Affected products

go-vikunja vikunja: from 0.13 before 2.2.1 — fixed in 2.2.1

How to fix

Upgrade to a fixed version: go-vikunja vikunja 2.2.1. Check the vendor advisory for mitigations.

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-p747-qc5p-773r
https://vikunja.io/changelog/vikunja-v2.2.0-was-released
https://vikunja.io/changelog/vikunja-v2.2.2-was-released

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