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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a75479 Patch
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84 Exploit, Vendor Advisory
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84 Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.5 · vikunjaNVD modified 2026-10-26 21:10
Affected (CPE criteria) 1
cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*
References 5
- https://github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a75479 Patch
- https://github.com/go-vikunja/vikunja/pull/2581 Issue Tracking
- https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 Release Notes
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84 Exploit, Vendor Advisory
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84 Exploit, Vendor Advisory