Zitadel Before 4.17.1 Authentication Bypass Via Login V2 Otp Returncode

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Zitadel Before 4.17.1 Authentication Bypass Via Login V2 Otp Returncode

www.vulncheck.com • October 4, 2026

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Zitadel Vulnerabilities: Authentication Bypass and MFA Issues Multiple vulnerabilities have been identified in Zitadel versions prior to 4.17.1, including authentication bypass via Login V2 for deactivated organizations and unauthenticated MFA enrollment via Login V1 init handlers. These vulnerabilities, which include CVE-2026-558c-v5wc-9w4q, allow unauthorized access and potential account takeover. The affected versions are Zitadel 0.0.0 to 4.17.0. The vulnerabilities are significant as they could lead to unauthorized actions within the system. No has been reported as of now, but the vulnerabilities are concerning enough to warrant immediate attention from users. Patches are expected to be released soon, and organizations are advised to monitor for updates. 43

Extracted Entities

CWE Weaknesses (1)

CWE-287 - Improper Authentication

Vulnerabilities (1)

Authentication Bypass Via Login V2 Otp Returncode Vulnerability