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CVE-2026-35594

Vikunja Link Share JWT tokens remain valid for 72 hours after share deletion or permission downgrade

Published: Apr 10, 2026Updated: Apr 24, 2026 Sources: CVE List NVDCWE-613
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 81.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-613

Affected Products

vikunjavikunja
On-prem
Enterprise Software / collaboration-groupware
vikunjago-vikunja
On-prem
Cloud & SaaS / saas-application
vikunjaoss-projectEnterprise Software
go-vikunjaoss-projectCloud & SaaSaka vikunja

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Defense Evasion
Initial Access
View detailed technique mapping

References

https://github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a75479
github.com
https://github.com/go-vikunja/vikunja/pull/2581
github.com
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
github.com
and 1 more references View all →

Timeline

Published
Apr 10, 2026
Last Updated
Apr 24, 2026

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