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FreeMarker contains a flaw that may allow a remote attacker to execute arbitrary commands or code. The issue is due to program not properly sanitizing user input when parsing template names, specifically directory traversal style attacks (e.g., ../../) supplied via path names which contain the 'u0000' code point. This may allow an attacker to include a file from the targeted host that contains arbitrary commands or code that will be executed by the vulnerable script. Such attacks are limited due to the script only calling files already on the target host. In addition, this flaw can potentially be used to disclose the contents of any file on the system accessible by the web server.
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