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Test your applicationsUpgrade typo3/cms
to version 6.2.20 or higher.
typo3/cms is a free open source Content Management Framework.
Affected versions of this package are vulnerable to Information Exposure due to improper validation of user input in the form
component. An attacker can disclose files arbitrarily by exploiting upload fields in forms.
Note
This is only exploitable by an attacker with a valid backend user account and only in forms that contain upload fields.