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WebCalendar contains a flaw that may allow a remote attacker to execute arbitrary commands. The issue is due to includes/config.php not properly sanitizing user input supplied to the 'includedir' variable. This may allow an attacker to include a file from a remote host that contains arbitrary commands which will be executed by the vulnerable script. This can be exploited further to disclose the content of arbitrary files by including a malicious settings.php file which overwrites the "user_inc" variable and will allow arbitrary local file disclosure.
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