Livio-Aco

**Name of the Vulnerable Software and Affected Versions** ZITADEL versions prior to 2.16.4 ZITADEL versions prior to 2.17.3 **Description** ZITADEL is a combination of Auth0 and Keycloak. RefreshTokens is an OAuth 2.0 feature that allows applications to retrieve new access tokens and refresh the user's session without the need for interacting with a UI. RefreshTokens were not invalidated when a user was locked or deactivated. The deactivated or locked user was able to obtain a valid access token only through a refresh token grant. When the locked or deactivated user’s session was already terminated (“logged out”) then it was not possible to create a new session. Renewal of access token through a refresh token grant is limited to the configured amount of time (`RefreshTokenExpiration`). **Recommendations** For versions prior to 2.16.4, update to version 2.16.4 or later. For versions prior to 2.17.3, update to version 2.17.3 or later. As a temporary workaround, ensure the `RefreshTokenExpiration` in the OIDC settings of your instance is set according to your security requirements.