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Test your applicationsUpgrade typo3/cms-core
to version 7.6.32, 8.7.21, 9.5.2 or higher.
typo3/cms-core is a free open source enterprise content management system.
Affected versions of this package are vulnerable to Insecure Defaults. It has been discovered that cookies created in the Install Tool are not hardened to be submitted only via HTTP. In combination with other vulnerabilities such as cross-site scripting it can lead to hijacking an active and valid session in the Install Tool.