Concrete5 versions 8.5.5 suffer from a logging settings phar deserialization vulnerability. User input passed through the logFile request parameter is not properly sanitized before being used in a call to the file_exists() function at line 91. This can be exploited by malicious users to inject arbitrary PHP objects into the application scope (PHP Object Injection via phar:// stream wrapper), allowing them to carry out a variety of attacks, such as executing arbitrary PHP code. Successful exploitation of this vulnerability requires an administrator account.
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