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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| go-vikunja | vikunja | < 2.6.0 | 2.6.0 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | code.vikunja.io/api | < 2.6.0 | 2.6.0 | GHSA-qfwc-vx6f-3g6g |
| Go | code.vikunja.io/api | all versions | — | GO-2026-6747 |
References
- GitHub Security Advisory (GHSA-qfwc-vx6f-3g6g) vendor-advisory
- VulnCheck Advisory: Vikunja before 2.6.0 Privilege Escalation via Link Share Hash third-party-advisory