Zitadel up to 2.71.18/3.4.3/4.6.5 improper authentication

Summaryinfo

A vulnerability marked as critical has been reported in Zitadel up to 2.71.18/3.4.3/4.6.5. The affected element is an unknown function. This manipulation causes improper authentication. This vulnerability is handled as CVE-2025-64717. The attack can be initiated remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Zitadel up to 2.71.18/3.4.3/4.6.5. Affected by this vulnerability is an unknown code. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

ZITADEL is an open source identity management platform. Starting in version 2.50.0 and prior to versions 2.71.19, 3.4.4, and 4.6.6, a vulnerability in ZITADEL's federation process allowed auto-linking users from external identity providers to existing users in ZITADEL even if the corresponding IdP was not active or if the organization did not allow federated authentication. This vulnerability stems from the platform's failure to correctly check or enforce an organization's specific security settings during the authentication flow. An Organization Administrator can explicitly disable an IdP or disallow federation, but this setting was not being honored during the auto-linking process. This allowed an unauthenticated attacker to initiate a login using an IdP that should have been disabled for that organization. The platform would incorrectly validate the login and, based on a matching criteria, link the attacker's external identity to an existing internal user account. This may result in a full Account Takeover, bypassing the organization's mandated security controls. Note that accounts with MFA enabled can not be taken over by this attack. Also note that only IdPs create on an instance level would allow this to work. IdPs registered on another organization would always be denied in the (auto-)linking process. Versions 4.6.6, 3.4.4, and 2.71.19 resolve the issue by correctly validating the organization's login policy before auto-linking an external user. No known workarounds are available aside from upgrading.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2025-64717 since 11/10/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation needs additional levels of successful authentication. The technical details are unknown and an exploit is not publicly available.

Upgrading to version 2.71.19, 3.4.4 or 4.6.6 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Name

• Zitadel

Version

• 2.71.0
• 2.71.1
• 2.71.2
• 2.71.3
• 2.71.4
• 2.71.5
• 2.71.6
• 2.71.7
• 2.71.8
• 2.71.9
• 2.71.10
• 2.71.11
• 2.71.12
• 2.71.13
• 2.71.14
• 2.71.15
• 2.71.16
• 2.71.17
• 2.71.18
• 3.4.0
• 3.4.1
• 3.4.2
• 3.4.3
• 4.6.0
• 4.6.1
• 4.6.2
• 4.6.3
• 4.6.4
• 4.6.5

Website

• Product: https://github.com/zitadel/zitadel/

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