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Test your applicationsUpgrade typo3/cms-core
to version 8.7.27, 9.5.8 or higher.
typo3/cms-core is a free open source enterprise content management system.
Affected versions of this package are vulnerable to Information Disclosure. The element information component used to display properties of a certain record is susceptible to information disclosure. The list of references from or to the record is not properly checked for the backend user’s permissions. A valid backend user account is needed in order to exploit this vulnerability.