$result  = `/usr/bin/perl -v`;

does not contain user-supplied input. User-supplied input is what security-conscious hosts forbid. See perlsec for how it works.

Updated:

As other respondents have shown, your method would be ineffective even if it did not breach security, so I have deleted my original suggestions for putting an untainted module name between the backticks. The eval "use $module; 1" suggestion from lamp, besides having the advantage of actually working, is free of security concerns.

In reply to Re^3: Calling perl from CGI by Narveson
in thread Calling perl from CGI by PerlRob

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