What’s Vulnerable › Vulnerabilities

CVE-2026-85056: ZITADEL: MFA bypass via session reuse in Login V2

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-24 · updated 2026-09-28
• Weakness: CWE-287

Description

ZITADEL is an open source identity management platform. From 4.0.0 until 4.16.1, ZITADEL Login V2 creates a browser session after password verification and can reuse that session for a later authentication request without verifying a user's enrolled TOTP, OTP, or U2F second factor. When the MFA step is abandoned and login starts again, session-validity checks require MFA only when the organization enables Force MFA or Force MFA for local users only, so a voluntarily enrolled factor can be skipped while completing an OIDC or SAML callback for a customer application. Login V1, the ZITADEL Console, Management and Admin APIs, and user self-management are not affected. This issue is fixed in version 4.16.1.

Affected products

• zitadel: from 4.0.0, < 4.16.1

References

• https://github.com/zitadel/zitadel/commit/049dbb25a56587fb3980c85c99819cad69f637db
• https://github.com/zitadel/zitadel/commit/56f4798ed31fc1cfcd9a0e7f6f0152289d2fdc43
• https://github.com/zitadel/zitadel/releases/tag/v4.16.1
• https://github.com/zitadel/zitadel/security/advisories/GHSA-9993-rfwp-rhwf

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