CVE-2026-91985
8.7
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
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| go-vikunja | vikunja | 0 < 2.6.0 | affected |
| go-vikunja | vikunja | 2.6.0 | unaffected |
Weaknesses
- CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: poc
- Automatable: yes
- Technical Impact: partial
Additional References
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
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