PHP file inclusion via insert tags
### Impact
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.
### Patches
Update to Contao 4.4.56, 4.9.18 or 4.11.7.
### Workarounds
Disable the login for untrusted back end users.
### References
https://contao.org/en/security-advisories/php-file-inclusion-via-insert-tags
### For more information
If you have any questions or comments about this advisory, open an issue in contao/contao
https://github.com/contao/contao/issues/new/choose.