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vikunja

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 identifies an improper authentication vulnerability (CWE-287) in the go-vikunja Vikunja platform, an open-source, self-hosted task management system. The vulnerability exists in versions from 0.13 up to but not including 2.2.1. It specifically affects the implementation of two-factor authentication (2FA) using Time-based One-Time Passwords (TOTP). Normally, TOTP codes are valid for a 30-second window and intended for one-time use to enhance security. However, this vulnerability allows a user with 2FA enabled to reuse the same TOTP multiple times within that 30-second window, effectively bypassing the intended one-time use constraint. This flaw arises from improper validation logic that does not prevent reuse of the same TOTP within its validity period. The CVSS 3.1 base score is 5.7 (medium severity), reflecting that the attack vector is network-based with low attack complexity, requiring privileges and user interaction. The impact is primarily on confidentiality, as unauthorized access to user accounts or data could occur without affecting data integrity or system availability. The vulnerability was publicly disclosed on March 24, 2026, and fixed in Vikunja version 2.2.1. No known exploits have been reported in the wild to date. The flaw is significant because it undermines the security guarantees of 2FA, a critical defense mechanism for user authentication in modern applications.

Detailed information about CVE-2026-33473: CWE-287: Improper Authentication in go-vikunja vikunja affecting go-vikunja vikunja. Get real-time updates, technical

CVE-2026-33473: CWE-287: Improper Authentication in go-vikunja vikunja - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-33473: CWE-287: Improper Authentication in go-vikunja vikunja

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