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Test your applicationsUpgrade silverstripe/framework to version 3.1.20, 3.2.5, 3.3.3, 3.4.1 or higher.
silverstripe/framework is a PHP framework forming the base for the SilverStripe CMS.
Affected versions of this package are vulnerable to Insufficient Session Expiration due to the handling of alc_enc cookies. An attacker can maintain unauthorized access by exploiting the cookie authentication mechanism when the 'remember me' feature is disabled by the developer but pre-existing cookies are still valid.