Here you will find a list of vulnerabilities that have already been found and fixed in Contao.
Unrestricted file uploads
CVE ID: CVE-2019-19745
A back end user with access to the form generator can upload arbitrary files and execute them on the server.
Contao 4.4 up to 4.4.45
Contao 4.8 up to 4.8.5
Update to Contao 4.4.46 or 4.8.6.
Configure your web server so it does not execute PHP files and other scripts in the Contao file upload directory.
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If you think that you have found a security issue in Contao, please report it according to our security policy.