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Start learningUpgrade typo3/cms-core
to version 8.7.23, 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 Broken Access Control. Backend users having limited access to specific languages are capable of modifying and creating pages in the default language which actually should be disallowed. A valid backend user account is needed in order to exploit this vulnerability.