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Vikunja EUVD-2026-21417

| CVE-2026-35594 MEDIUM
Insufficient Session Expiration (CWE-613)
2026-04-10 GitHub_M GHSA-96q5-xm3p-7m84
Information Disclosure Vikunja
6.5
CVSS 3.1 · GitHub Advisory
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GitHub Advisory PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch released
Apr 10, 2026 - 20:30 nvd
Patch available
EUVD ID Assigned
Apr 10, 2026 - 16:00 euvd
EUVD-2026-21417
Analysis Generated
Apr 10, 2026 - 16:00 vuln.today
CVE Published
Apr 10, 2026 - 15:55 nvd
MEDIUM 6.5

DescriptionGitHub Advisory

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.

AnalysisAI

Vikunja prior to version 2.3.0 fails to validate link share permissions against server state during JWT authentication, allowing attackers with revoked or downgraded JWT tokens to maintain the original access level for up to 72 hours. This affects self-hosted task management deployments where link shares are used for collaboration, enabling unauthorized information disclosure and modification of shared projects even after a project owner explicitly revokes or restricts access.

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Vulnerability AssessmentAI

Risk Assessment The CVSS 6.5 (Medium) score reflects the moderate but real-world impact: network-accessible, unauthenticated attack surface (AV:N, PR:N) with low complexity (AC:L), but limited scope (information disclosure and modification only, no system-wide impact). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker obtains a Vikunja link share URL (e.g., shared by a collaborator or discovered via OSINT) that grants read access to a project. The project owner later realizes the link was leaked, revokes the share via the Vikunja UI, and believes access is terminated. …
Remediation Vendor-released patch: Vikunja 2.3.0 and later. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-21417 vulnerability details – vuln.today
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