CVE-2026-105213: ZITADEL before 4.17.1 Authentication Bypass via Login V2 for Deactivated Organizations

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-04 · updated 2026-10-05
Weakness: CWE-287

Description

ZITADEL 4.x before 4.17.1 does not check an organization's inactive state during Login V2 authentication, verifying only the individual user's status. Users of a deactivated organization who hold valid credentials, an existing session, or a refresh token can still sign in, create sessions, and obtain or refresh tokens.

Affected products

zitadel: before 4.17.1 — fixed in 4.17.1

How to fix

Upgrade to a fixed version: zitadel 4.17.1. Check the vendor advisory for mitigations.

References

https://github.com/zitadel/zitadel/security/advisories/GHSA-558c-v5wc-9w4q
https://www.vulncheck.com/advisories/zitadel-before-4.17.1-authentication-bypass-via-login-v2-for-deactivated-organizations

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