Vulnerability in Go-Vikunja Vikunja
CVE-2026-123526
Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.
Vulnerability class: Mass Assignment
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-fjrf-gjmg-9v6g) (vendor-advisory)
- VulnCheck Advisory: Vikunja before 2.7.1 Mass Assignment via Team external_id Field (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123526?
- CVE-2026-123526 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 5.4/10. Published 2026-11-08.
- How severe is CVE-2026-123526?
- Medium severity. CVSS v3 base score is 5.4 out of 10.