CVE-2025-57770: zitadel — Fix

Description

The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Versions 4.0.0 to 4.0.2, 3.0.0 to 3.3.6, and all versions prior to 2.71.15 are vulnerable to a username enumeration issue in the login interface. The login UI includes a security feature, Ignoring unknown usernames, that is intended to prevent username enumeration by returning a generic response for both valid and invalid usernames. This vulnerability allows an unauthenticated attacker to bypass this protection by submitting arbitrary userIDs to the select account page and distinguishing between valid and invalid accounts based on the system's response. For effective exploitation, an attacker needs to iterate through possible userIDs, but the impact can be limited by implementing rate limiting or similar measures. The issue has been patched in versions 4.0.3, 3.4.0, and 2.71.15.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-203 CWE-203

Affected Products

Vendor	Product	Versions
zitadel	zitadel	< 2.71.15
zitadel	zitadel	3.0.0 — 3.4.0
zitadel	zitadel	4.0.0 — 4.0.3

References

Advisories & Patches

https://github.com/zitadel/zitadel/commit/7abe759c95cb360524d88b51744d03cbb6e4dcdb https://github.com/zitadel/zitadel/security/advisories/GHSA-g9c3-xh6v-fr86

Other References

https://github.com/zitadel/zitadel/releases/tag/v2.71.15 https://github.com/zitadel/zitadel/releases/tag/v3.4.0 https://github.com/zitadel/zitadel/releases/tag/v4.0.3 https://zitadel.com/docs/self-hosting/manage/production#limits-and-quotas

Frequently Asked Questions

What is CVE-2025-57770? +

The open-source identity infrastructure software Zitadel allows administrators to disable the user self-registration. Versions 4.0.0 to 4.0.2, 3.0.0 to 3.3.6, and all versions prior to 2.71.15 are vulnerable to a username enumeration issue in the login interface. The login UI includes a security feature, Ignoring unknown usernames, that is intended to prevent username enumeration by returning a generic response for both valid and invalid usernames. This vulnerability allows an unauthenticated attacker to bypass this protection by submitting arbitrary userIDs to the select account page and distinguishing between valid and invalid accounts based on the system's response. For effective exploitation, an attacker needs to iterate through possible userIDs, but the impact can be limited by implementing rate limiting or similar measures. The issue has been patched in versions 4.0.3, 3.4.0, and 2.71.15. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-57770? +

CVE-2025-57770 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-57770? +

CVE-2025-57770 affects products from zitadel, specifically: zitadel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-57770? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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