Vulnerability in Go-Vikunja Vikunja
CVE-2026-123517
Vikunja before 2.7.1 contains an information disclosure vulnerability that allows authenticated users to determine whether private teams exist by calling the team member self-removal endpoint. Attackers can send DELETE requests to /teams/{id}/members/{own username} for arbitrary team ids and use the distinguishable responses to learn if a team exists, is SSO-managed, or has a single member.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
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 Security Advisory (GHSA-v3r6-33v3-79c2) (vendor-advisory)
- VulnCheck Advisory: Vikunja before 2.7.1 Information Disclosure via Team Self-Removal Endpoint (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123517?
- CVE-2026-123517 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Observable Response Discrepancy. CVSS score: 4.3/10. Published 2026-11-08.
- How severe is CVE-2026-123517?
- Medium severity. CVSS v3 base score is 4.3 out of 10.