CVE-2026-91985

Description

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.

CVSS Vector

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
• https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g