CVE-2026-28268

Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse

State: Published
Severity: 9.8 Critical
Published: Feb 27, 2026
Updated: Mar 3, 2026
Reserved: Feb 26, 2026

Description

Vikunja is an open-source self-hosted task management platform. Versions prior to 2.1.0 have a business logic vulnerability exists in the password reset mechanism of vikunja/api that allows password reset tokens to be reused indefinitely. Due to a failure to invalidate tokens upon use and a critical logic bug in the token cleanup cron job, reset tokens remain valid forever. This allows an attacker who intercepts a single reset token (via logs, browser history, or phishing) to perform a complete, persistent account takeover at any point in the future, bypassing standard authentication controls. Version 2.1.0 contains a patch for the issue.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-459 Incomplete Cleanup
CWE-640 Weak Password Recovery Mechanism for Forgotten Password

Affected Products

Product	Versions
vikunjago-vikunja	< 2.1.0Affected

References

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