CVE-2026-91985
Vikunja before 2.6.0 fails to properly restrict access to the link-share hash field in single-share read endpoints, allowing read-only members to obtain the share's secret credential. Attackers can exchange the disclosed hash for a link-share JWT at the share's permission level to escalate privileges and perform unauthorized writes or administrative actions.
- Score
- CVSS 4.0 8.7 High
- Status
- Deferred - disclosure@vulncheck.com
- Published
- 2026-09-15
- Last modified
- 2026-09-15
- Weaknesses
- CWE-200
Affected products
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g
- https://www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hash
