Medium severity · published Apr 10, 2026
CVE-2026-35594
Vikunja Link Share JWT tokens remain valid for 72 hours after share deletion or permission downgrade
6.5
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
< 2.3.0 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-35594
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-35594
Patch
https://github.com/go-vikunja/vikunja/commit/379d8a5c19334ffe4846003f590e202c31a75479
Issue Tracking
https://github.com/go-vikunja/vikunja/pull/2581
Release Notes
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0
Exploit
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-96q5-xm3p-7m84
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