High severity · published Oct 4, 2026
CVE-2026-105210
ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers
8.2
CVSS
0.2%
EPSS
No
On KEV
Description
ZITADEL 3.x before 3.4.15 and 4.x before 4.17.1 contains a missing authentication flaw in the hosted Login V1 UI, whose second-factor enrollment and initialization handlers act on an identify-only session before any primary factor is verified. Attackers knowing only a victim's login name can enroll attacker-controlled TOTP, OTP-SMS, OTP-Email, or U2F factors, overwrite the verified phone number, and enumerate users through discrepant errors.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 15% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZI
zitadel · zitadel
before 4.17.1; before 3.4.15 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-105210
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-105210
vendor-advisory
https://github.com/zitadel/zitadel/security/advisories/GHSA-72q5-mv5c-vxv4
third-party-advisory
https://www.vulncheck.com/advisories/zitadel-before-4.17.1-unauthenticated-mfa-enrollment-via-login-v1-init-handlers
More from zitadel
9.8
CVE-2026-105207
ZITADEL before 4.17.3 Account Takeover via External IdP Linking
9.8
CVE-2025-64717
ZITADEL vulnerable to Account Takeover with deactivated Instance IdP
9.8
CVE-2025-64103
Zitadel Bypass Second Authentication Factor
9.8
CVE-2025-64102
Zitadel allows brute-forcing authentication factors
9.6
CVE-2026-105209
ZITADEL before 3.4.15 and 4.17.1 Cross-Organization Account Takeover via Passkey Enrollment