Auth bypass in Zitadel
CVE-2026-105209
ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains an improper authorization vulnerability: when issuing passkey or passwordless enrollment codes, it checks only the organization in the x-zitadel-orgid header, not the target user's organization. Attackers with user-write permission in one organization can obtain an enrollment code for a user in another organization on the same instance and register their own authenticator to take over that account.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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.com/zitadel/zitadel/security/advisories/GHSA-pq2q-2c6r-75c4 (vendor-advisory)
- www.vulncheck.com/advisories/zitadel-before-3.4.15-and-4.17.1-cross-organizatio… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-105209?
- CVE-2026-105209 is a critical-severity vulnerability in Zitadel, classified under Missing Authorization. CVSS score: 9.6/10. Published 2026-10-04.
- How severe is CVE-2026-105209?
- Critical severity. CVSS v3 base score is 9.6 out of 10.