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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.
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OR
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.64.0 up to (excluding) 2.64.6
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.65.0 up to (excluding) 2.65.7
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.66.0 up to (excluding) 2.66.16
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.67.0 up to (excluding) 2.67.13
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.68.0 up to (excluding) 2.68.9
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.69.0 up to (excluding) 2.69.9
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions up to (excluding) 2.63.9
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.70.0 up to (excluding) 2.70.8
*cpe:2.3:a:zitadel:zitadel:*:*:*:*:*:*:*:* versions from (including) 2.71.0 up to (excluding) 2.71.6
New CVE Received from GitHub, Inc.3/31/2025 4:15:15 PM
Action
Type
Old Value
New Value
Added
Description
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.
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