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9.2
CVE-2026-105211: ZITADEL lets attackers hijack accounts using OTP codes
CVE-2026-105211 · published 14 days ago
Summary
If you use ZITADEL version earlier than 4.17.1, a flaw in its login process can let an unauthenticated person obtain the one‑time passwords sent by email or text. With those codes, the attacker can log in as any user, including administrators, and take over the account. Update ZITADEL to the latest version as soon as possible to close this gap.
Original advisory text
ZITADEL before 4.17.1 Authentication Bypass via Login V2 OTP returnCode
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.
References
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/105xxx/CVE-2026-1052... Vendor Advisory
- https://github.com/zitadel/zitadel/security/advisories/GHSA-3gwm-5wx8-4gm6
- https://nvd.nist.gov/vuln/detail/CVE-2026-105211 Vendor Advisory
- https://www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass...
Internet-facing
14 days
Internal
At next upgrade
- Not known to be exploited
- Needs hands-on effort to exploit
- Gives an attacker full control
Type
CWE-200Information Exposure
Timeline
Published4 Oct 2026
Updated15 Oct 2026
First seen4 Oct 2026
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