What’s Vulnerable › Vulnerabilities

CVE-2026-28268: Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-27 · updated 2026-06-17
• Weakness: CWE-459

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.

Affected products

• go-vikunja vikunja: before 2.1.0 — fixed in 2.1.0

How to fix

Upgrade to a fixed version: go-vikunja vikunja 2.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/go-vikunja/vikunja/commit/5c2195f9fca9ad208477e865e6009c37889f87b2
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-rfjg-6m84-crj2
• https://vikunja.io/changelog/vikunja-v2.1.0-was-released

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