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

Quick assessment

Affected
go-vikunja vikunja
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 2.1.0之前版本存在授权问题漏洞，该漏洞源于密码重置令牌可被无限期重用，可能导致账户接管。

CVSS 9.8 · Critical EPSS 0.89% · P58

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force
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I. Basic Information for CVE-2026-28268

Vulnerability Information
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Vulnerability Title
Vikunja Vulnerable to Account Takeover via Password Reset Token Reuse
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
清理环节不完整
Source: CVE Program / CVE List V5
Vulnerability Title
Vikunja 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 2.1.0之前版本存在授权问题漏洞，该漏洞源于密码重置令牌可被无限期重用，可能导致账户接管。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
go-vikunja vikunja < 2.1.0 -

II. Public POCs for CVE-2026-28268

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6689 chars
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III. Intelligence Information for CVE-2026-28268

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Vendor Advisories for CVE-2026-28268 (1)

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-459

V. Comments for CVE-2026-28268

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