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Test your applicationsUpgrade typo3/cms-core
to versions 8.7.17, 9.3.2 or higher.
typo3/cms-core is a free open source Content Management Framework initially created by Kasper Skaarhoj and licensed under GNU/GPL.
Affected versions of this package are vulnerable to SQL Injection and Privilege Escalation. Instructions can be persisted to a form definition file that were not configured to be modified.