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Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

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

Medium 6.5

In plain English

A medium-severity security flaw in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 23% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.3%top 76.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gocode.vikunja.io/api2.3.0GHSA-96q5-xm3p-7m84
Gocode.vikunja.io/apino fix listedGO-2026-5276

Affected products (as reported)

VendorProductVersions
go-vikunja vikunja < 2.3.0

Weakness: CWE-613 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

References