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

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Summary

CVECVE-2026-35594
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-10 16:16:32 UTC
Updated2026-04-10 16:16:32 UTC
DescriptionVikunja 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.000380000 probability, percentile 0.114130000 (date 2026-04-11)

Problem Types: CWE-613 | CWE-613 CWE-613: Insufficient Session Expiration

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Go-vikunja Vikunja affected < 2.3.0 Not specified

References

ReferenceSourceLinkTags
github.com/go-vikunja/vikunja/releases/tag/v2.3.0 [email protected] github.com
github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84 [email protected] github.com
github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a... [email protected] github.com
github.com/go-vikunja/vikunja/pull/2581 [email protected] github.com
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