CVE-2023-44399 ZITADEL's password reset does not respect the "Ignoring unknown usernames" setting

What is CVE-2023-44399?

CVE-2023-44399 is a medium-severity vulnerability in zitadel, published on 10 Oct 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

ZITADEL provides identity infrastructure. In versions 2.37.2 and prior, ZITADEL administrators can enable a setting called "Ignoring unknown usernames" which helps mitigate attacks that try to guess/enumerate usernames. While this settings was properly working during the authentication process it did not work correctly on the password reset flow. This meant that even if this feature was active that an attacker could use the password reset function to verify if an account exist within ZITADEL. This bug has been patched in versions 2.37.3 and 2.38.0. No known workarounds are available.

Weakness: CWE-640

Which versions are affected by CVE-2023-44399?

2 open source packages ship an affected version, including github.com/zitadel/zitadel. It affects 1 product.

Products include Zitadel Zitadel.

How do I fix CVE-2023-44399?

Upgrade github.com/zitadel/zitadel to 2.37.3 or later.

Is CVE-2023-44399 being exploited?

There is no known exploitation of CVE-2023-44399 in the wild and no public exploit code.

Other vulnerabilities in zitadel

• CVE-2026-29191 ZITADEL: 1-Click Account Takeover via XSS in /saml-post Endpoint Critical 9.3
• CVE-2025-67494 ZITADEL Vulnerable to Unauthenticated Full-Read SSRF via V2 Login Critical 9.3
• CVE-2025-27507 IDOR Vulnerabilities in ZITADEL's Admin API that Primarily Impact LDAP Configurations Critical 9.0
• CVE-2025-64103 Zitadel Bypass Second Authentication Factor High 8.7
• CVE-2025-31123 Zitadel Expired JWT Keys Usable for Authorization Grants High 8.7

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-v683-rcxx-vpff.