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EUVD-2025-8871 · Published Mar 31, 2025
Zitadel is open-source identity infrastructure software. ZITADEL administrators can enable a setting called "Ignoring unknown usernames" which helps mitigate attacks that try to guess/enumerate usernames. If enabled, ZITADEL will show the password prompt even if the user doesn't exist and report "Username or Password invalid". While the setting was correctly respected during the login flow, the user's username was normalized leading to a disclosure of the user's existence. This vulnerability is fixed in 2.71.6, 2.70.8, 2.69.9, 2.68.9, 2.67.13, 2.66.16, 2.65.7, 2.64.6, and 2.63.9.
Technologies
Zitadel Zitadel
Weaknesses
CWE-200CWE-203CWE-204
CVSS scores
- v3.15.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
MITRE ATT&CK
InferredWhere this vulnerability fits in an attack
Reconnaissance Initial Access Discovery
References
- https://github.com/zitadel/zitadel/commit/14de8ecac2afafee4975ed7ac26f3ca4a2b0f82c
- https://github.com/zitadel/zitadel/releases/tag/v2.63.9
- https://github.com/zitadel/zitadel/releases/tag/v2.64.6
- https://github.com/zitadel/zitadel/releases/tag/v2.65.7
- https://github.com/zitadel/zitadel/releases/tag/v2.66.16
- https://github.com/zitadel/zitadel/releases/tag/v2.67.13
Potentially impacted assets
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