Here you will find a list of vulnerabilities that have already been found and fixed in Contao. If you think that you have found a security issue in Contao, please report it according to our security policy.
PHP file inclusion via insert tags
by Leo Feyer
CVE ID: CVE-2021-37626
It is possible for untrusted users to load arbitrary PHP files via insert tags.
Installations are only affected if there are untrusted back end users.
Contao 4.4 up to 4.4.55
Contao 4.9 up to 4.9.17
Contao 4.11 up to 4.11.6
Update to Contao 4.4.56, 4.9.18 or 4.11.7.
Disable the login for untrusted back end users.