Here you will find a list of vulnerabilities that have already been found and fixed in Contao.
PHP file inclusion in the back end
CVE ID: CVE-2017-10993
A logged in back end user can include arbitrary PHP files by manipulating an URL parameter. Since Contao does not allow to upload PHP files in the file manager, the attack is limited to the existing PHP files on the server.
Contao 3.5 up to 3.5.27
Contao 4.4 up to 4.4.0
Update to Contao 3.5.28 or 4.4.1.
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If you think that you have found a security issue in Contao, please report it according to our security policy.