Here you will find a list of vulnerabilities that have already been found and fixed in Contao.
SQL injection in the newsletter module
CVE ID: CVE-2018-5478
The vulnerability is in the "unsubscribe" module of the newsletter extension. It can easily be exploited by anyone without logging in in the front end.
Contao 3.5 up to 3.5.31
Update to Contao 3.5.32 or 4.1.0.
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If you think that you have found a security issue in Contao, please report it according to our security policy.