High severity7.5NVD Advisory· Published Sep 15, 2026· Updated Sep 15, 2026

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Go Vikunja/Vikunjallm-fuzzy
Range: <2.6.0

Patches

Vulnerability mechanics

References

github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6gnvd
www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link-share-hashnvd

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cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000