Introduction
What does it do?

The backend module System > Reports
The TYPO3 system extension EXT:reports displays the extendable backend module System > Reports for users with administrator role.
The Reports module groups several system reports and gives you a quick overview about important system statuses and site parameters.
Section "Security"

Regularly check the section Security
From a security perspective, the section Security should be checked regularly: it provides information about the administrator user account, encryption key, file deny pattern, Admin Tools checks and more.
Warning
In case of a compromised system, the information displayed here may have been manipulated by the attacker.
Thus, if no problems are pointed out - it does not necessarily mean that there are no security issues. But, on the other hand, if security problems are pointed out, you most certainly should fix them.