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Start learningUpgrade typo3/cms-core
to version 8.7.17, 9.3.2 or higher.
typo3/cms is a free open source Content Management Framework initially created by Kasper Skaarhoj and licensed under GNU/GPL.
Affected version so this package are vulnerable to Arbitrary Code Execution. Phar files can be obfuscated as image or text file which would not be denied from being uploaded and persisted to a TYPO3 installation. Due to a missing sanitization of user input, those Phar files can be invoked by manipulated URLs in TYPO3 backend forms.