CVE-2026-28268 | Vikunja is an open-source self-hosted task management platfo… | CVSS 9.8 CRITICAL

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.

Metadata

CVE ID: CVE-2026-28268
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-02-26 01:52 UTC
Published: 2026-02-27 20:16 UTC
Last updated: 2026-03-03 20:26 UTC
Primary CWE: CWE-459
CWE-459: Incomplete Cleanup
Vendor / Product: go-vikunja / vikunja
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
go-vikunja	vikunja	—	< 2.1.0

Weakness (CWE)

CWE	Source	Description
CWE-459	cna	CWE-459: Incomplete Cleanup
CWE-640	cna	CWE-640: Weak Password Recovery Mechanism for Forgotten Password

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (3)

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