Here you will find a list of vulnerabilities that have already been found and fixed in Contao.
Cross site scripting in the system log
CVE ID: CVE-2018-10125
With a manipulated request, an attacker can implant a script which is executed when a logged in back end user opens the system log. The attacker does not have to be logged in.
Contao 3.5 up to 3.5.33
Contao 4.4 up to 4.4.16
Contao 4.5 up to 4.5.6
Update to Contao 3.5.34, 4.4.17 or 4.5.7.
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If you think that you have found a security issue in Contao, please report it according to our security policy.