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CVE-2026-35594— Vikunja Link Share JWT tokens remain valid for 72 hours after share deletion or permission downgrade

CVSS 6.5 · Medium EPSS 0.13% · P32

Possible ATT&CK Techniques 1AI

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I. Basic Information for CVE-2026-35594

Vulnerability Information
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Vulnerability Title
Vikunja Link Share JWT tokens remain valid for 72 hours after share deletion or permission downgrade
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's link share authentication (GetLinkShareFromClaims in pkg/models/link_sharing.go) constructs authorization objects entirely from JWT claims without any server-side database validation. When a project owner deletes a link share or downgrades its permissions, all previously issued JWTs continue to grant the original permission level for up to 72 hours (the default service.jwtttl). This vulnerability is fixed in 2.3.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的会话过期机制
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vikunja 代码问题漏洞
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 2.3.0之前版本存在代码问题漏洞，该漏洞源于链接共享身份验证完全基于JWT声明构建授权对象，缺乏服务器端数据库验证，可能导致已删除或降权的链接共享令牌在默认有效期内仍保留原始权限。
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)

Affected Products

VendorProductAffected VersionsCPESubscribe
go-vikunjavikunja < 2.3.0 -

II. Public POCs for CVE-2026-35594

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III. Intelligence Information for CVE-2026-35594

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Patches & Fixes for CVE-2026-35594 (2)

Vendor Advisories for CVE-2026-35594 (1)

Vendor Pages for CVE-2026-35594 (1)

Same Patch Batch · go-vikunja · 2026-04-10 · 11 CVEs total

CVE-2026-355958.3 HIGHVikunja Affected by Privilege Escalation via Project Reparenting
CVE-2026-347277.4 HIGHVikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path
CVE-2026-355996.5 MEDIUMVikunja has an Algorithmic Complexity DoS in Repeating Task Handler
CVE-2026-355975.9 MEDIUMVikunja Affected by TOTP Brute-Force Due to Non-Functional Account Lockout
CVE-2026-356005.4 MEDIUMVikunja has HTML Injection via Task Titles in Overdue Email Notifications
CVE-2026-356025.4 MEDIUMVikunja has a File Size Limit Bypass via Vikunja Import
CVE-2026-355964.3 MEDIUMVikunja has Broken Access Control on Label Read via SQL Operator Precedence Bug
CVE-2026-355984.3 MEDIUMVikunja has Missing Authorization on CalDAV Task Read
CVE-2026-401034.3 MEDIUMVikunja's Scoped API tokens with projects.background permission can delete project backgro
CVE-2026-356014.1 MEDIUMVikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output

IV. Related Vulnerabilities

Same product: vikunja
Same vendor: go-vikunja
Same weakness: CWE-613

V. Comments for CVE-2026-35594

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