What is CVE-2026-105211?

CVE-2026-105211 is a high-severity vulnerability in Zitadel, classified under Information Disclosure. CVSS score: 8.1/10. Published 2026-10-04.

How severe is CVE-2026-105211?

High severity. CVSS v3 base score is 8.1 out of 10.

Information disclosure in Zitadel

CVE-2026-105211

ZITADEL before 4.17.1 contains an authentication bypass vulnerability in Login V2 that allows unauthenticated attackers to take over accounts by obtaining OTP codes via the returnCode delivery type. Attackers knowing a login name of a victim with OTP-Email and OTP-SMS enrolled can read both codes from server-action responses to gain MFA-authenticated sessions, including administrator takeover.

Vulnerability class: Information Disclosure

Published 2026-10-04 · last modified 2026-10-04.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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

Zitadel

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6 (vendor-advisory)
www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-lo… (third-party-advisory)

Frequently asked questions

What is CVE-2026-105211?: CVE-2026-105211 is a high-severity vulnerability in Zitadel, classified under Information Disclosure. CVSS score: 8.1/10. Published 2026-10-04.
How severe is CVE-2026-105211?: High severity. CVSS v3 base score is 8.1 out of 10.