CVE-2026-35594

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.

• CWE-613

• https://github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a75479Patch
• https://github.com/go-vikunja/vikunja/pull/2581Issue Tracking
• https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0Release Notes
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84Exploit, Vendor Advisory
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84Exploit, Vendor Advisory

Published

Apr 10, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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