source: https://www.securityfocus.com/bid/14960/info A remote command execution vulnerability affects the application. The revision control function of the TWikiUsers script uses the backtick shell metacharacter to construct a command line. An attacker may use a specially crafted URI to execute arbitrary commands through the shell. This attack would occur in the context of the vulnerable application and can facilitate unauthorized remote access. %INCLUDE{ "Main.TWikiUsers" rev="2|less /etc/passwd" }%