CVE-2026-105210 ZITADEL before 4.17.1 Unauthenticated MFA Enrollment via Login V1 Init Handlers
Attackers can bypass authentication to enroll malicious MFA factors and enumerate users in ZITADEL by exploiting unverified session handlers.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105210?
CVE-2026-105210 is a high-severity authentication bypass vulnerability in zitadel, published on 4 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Weakness: CWE-287
Which versions are affected by CVE-2026-105210?
How do I fix CVE-2026-105210?
No fix has been published for CVE-2026-105210 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-105210 being exploited?
There is no known exploitation of CVE-2026-105210 in the wild and no public exploit code.
Sources
Also known as GHSA-72q5-mv5c-vxv4, GHSA-j55w-p4wc-frwh.