CVE-2026-91985
Vikunja before 2.6.0 Privilege Escalation via Link Share Hash
- State
- Published
- Severity
- 8.7 High
- Published
- Sep 15, 2026
- Updated
- Sep 15, 2026
- Reserved
- Sep 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.5 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N | VulnCheck |
Weaknesses
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
Affected Products
| Product | Versions |
|---|---|
vikunjago-vikunja |
|
References
- GitHub Security Advisory (GHSA-qfwc-vx6f-3g6g)vendor-advisory
- VulnCheck Advisory: Vikunja before 2.6.0 Privilege Escalation via Link Share Hashthird-party-advisory
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