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S8Forum Remote Command Execution Vulnerability

S8Forum is prone to a remote command execution vulnerability.

When a user registers with the forum, a file is created locally with the specified username. The contents of this file will be the data entered by the user. As a result, a malicious user could create a file with an arbitrary name and PHP (.php) extension that contains valid PHP code. The attacker may then cause this file to be executed by requesting it via HTTP.