Auth bypass in Go-Vikunja Vikunja
CVE-2026-111921
Vikunja 0.13.0 before 2.7.0 contains an incorrect authorization vulnerability that allows project members with Write permission to delete admin-tier link shares because the delete permission check reads an unloaded share object. Attackers can send DELETE requests to the v1 or v2 projects shares endpoints with sequential share IDs to revoke admin links and invalidate existing share sessions.
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/go-vikunja/vikunja/security/advisories/GHSA-fmmf-xq98-g327 (vendor-advisory)
- www.vulncheck.com/advisories/vikunja-0.13.0-before-2.7.0-incorrect-authorizatio… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-111921?
- CVE-2026-111921 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Incorrect Authorization. CVSS score: 5.4/10. Published 2026-10-17.
- How severe is CVE-2026-111921?
- Medium severity. CVSS v3 base score is 5.4 out of 10.