CVE-2026-105211 ZITADEL - Authentication Bypass

ZITADEL < 4.17.1 contains an authentication bypass caused by OTP code exposure via returnCode delivery type in Login V2, letting unauthenticated attackers take over accounts including administrators, exploit requires victim to have OTP-Email and OTP-SMS enrolled.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
4 October 2026
Updated
15 October 2026
Weakness
CWE-200

Vendor fix

Update to version 4.17.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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