CVE-2026-105211
HIGH
NVD
CVSS Score
8.1
Severity
HIGH
Published
Oct 04, 2026
Vendor
unknown
Description
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.