Auth bypass in Go-Vikunja Vikunja
CVE-2026-123503
Vikunja before 2.7.1 contains an improper authorization vulnerability in canDoBucket that allows users with project write access to delete buckets via a mismatched view ID. Attackers can request deletion through another view's bucket endpoint to bypass the last-bucket rule, leaving dangling default/done bucket references and inconsistent task buckets.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
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 Security Advisory (GHSA-9xh7-5jg8-mf43) (vendor-advisory)
- VulnCheck Advisory: Vikunja before 2.7.1 Improper Authorization in Kanban Bucket Deletion (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123503?
- CVE-2026-123503 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 5.4/10. Published 2026-11-08.
- How severe is CVE-2026-123503?
- Medium severity. CVSS v3 base score is 5.4 out of 10.