Vulnerability · Published Oct 4, 2026 · Assigned by VulnCheck

CVE-2026-105210ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers

High 8.2

In plain English

A high-severity improper authentication in zitadel from zitadel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.2%top 85.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
zitadel	zitadel	4.0.0 – before 4.17.1
zitadel	zitadel	0 – before 3.4.15

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N

References

GitHub Security Advisory (GHSA-72q5-mv5c-vxv4) vendor-advisory
VulnCheck Advisory: ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers third-party-advisory