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Test your applicationsUpgrade silverstripe/framework
to version 4.0.4, 4.1.1 or higher.
silverstripe/framework is a PHP framework forming the base for the SilverStripe CMS.
Affected versions of this package are vulnerable to Information Exposure through the error messages displayed during the login process. An attacker can infer or confirm the existence of user details by observing the difference in error messages between existent and non-existent users.