Information disclosure in Go-Vikunja Vikunja
CVE-2026-91985
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (37.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-qfwc-vx6f-3g6g (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-before-2.6.0-privilege-escalation-via-link… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91985?
- CVE-2026-91985 is a high-severity vulnerability in Go-Vikunja Vikunja, classified under Information Disclosure. CVSS score: 7.5/10. Published 2026-09-15.
- How severe is CVE-2026-91985?
- High severity. CVSS v3 base score is 7.5 out of 10.