Contao 4.0 through 4.8.5 allows PHP local file inclusion. A back end user with access to the form generator can upload arbitrary files and execute them on the server.
Contao 4.0 through 4.8.5 has Insecure Permissions. Back end users can manipulate the details view URL to show pages and articles that have not been enabled for them.
Contao before 3.5.28 and 4.x before 4.4.1 allows remote attackers to include and execute arbitrary local PHP files via a crafted parameter in a URL, aka Directory Traversal.
Directory traversal vulnerability in Contao before 3.2.19, and 3.4.x before 3.4.4 allows remote authenticated "back end" users to view files outside their file mounts or the document root via unspecified vectors.