Zitadel up to 2.71.17/3.4.2/4.5.x HTTP Header Forwarded/X-Forwarded-Host redirect

Summaryinfo

A vulnerability, which was classified as problematic, was found in Zitadel up to 2.71.17/3.4.2/4.5.x. Affected is an unknown function of the component HTTP Header Handler. Executing a manipulation of the argument Forwarded/X-Forwarded-Host can lead to redirect. This vulnerability is tracked as CVE-2025-64101. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Zitadel up to 2.71.17/3.4.2/4.5.x. This vulnerability affects some unknown functionality of the component HTTP Header Handler. The manipulation of the argument Forwarded/X-Forwarded-Host with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity. CVE summarizes:

Zitadel is open-source identity infrastructure software. Prior to 4.6.0, 3.4.3, and 2.71.18, a potential vulnerability exists in ZITADEL's password reset mechanism. ZITADEL utilizes the Forwarded or X-Forwarded-Host header from incoming requests to construct the URL for the password reset confirmation link. This link, containing a secret code, is then emailed to the user. If an attacker can manipulate these headers (e.g., via host header injection), they could cause ZITADEL to generate a password reset link pointing to a malicious domain controlled by the attacker. If the user clicks this manipulated link in the email, the secret reset code embedded in the URL can be captured by the attacker. This captured code could then be used to reset the user's password and gain unauthorized access to their account. It's important to note that this specific attack vector is mitigated for accounts that have Multi-Factor Authentication (MFA) or Passwordless authentication enabled. This vulnerability is fixed in 4.6.0, 3.4.3, and 2.71.18.

The advisory is shared for download at github.com. This vulnerability was named CVE-2025-64101 since 10/27/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1204.001.

Upgrading to version 2.71.18, 3.4.3 or 4.6.0 eliminates this vulnerability. Applying the patch 72a5c33e6ac302b978d564bd049f9364f5a989b1 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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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
• 3.4.0
• 3.4.1
• 3.4.2
• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5

License

• open-source

Website

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

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