In your case, all you really need to do make sure that the id the user submits is valid. 
my $rpt_id = $CGI->param('rpt_id');

# trim any leading or trailing whitespace
$rpt_id =~ s/^\s*//;
$rpt_id =~ s/\s*$//;

# assuming report id is suppose to only contain digits
unless ($rpt_id =~ /^\d+$/) {
    # handle error - id contains more than digits
}

[download]
is just one example of "untainting" your paramaters that are submitted by someone (who could be trying to crack your CGI script). I recommend adding the taint switch to your "shebang" line: 
#!/usr/local/bin/perl5_8 -T

[download]
Since you have already untainted $rpt_id by making it part of $rpt_tmpl like so: 
my $rpt_tmpl = "cnc1_rpt" . $rpt_id . "_summary.tmpl";

# another way to achieve the same result:
my $rpt_tmpl = "cnc1_rpt@{[$rpt_id]}_summary.tmpl";

# and yet anther way
my $rpt_tmpl = sprintf("cnc1_rpt%d_summary.tmpl", $rpt_id);

[download]
you shouldn't have to worry about devious folks getting at other files like you would with the following DANGEROUS code: 
my $file = $CGI->param('file');
open FH, '<', "$PATH/$file";

[download]
Even though you supply the path, the user can still submit something like ../../../etc/passwd ... bad.

Your code appears safe enough as it is, but ... it's still a good idea to make sure that what you let the user to submit is restricted.

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to 3Re: HTML::Template, CGI - concatenating strings & variables by jeffa
in thread HTML::Template, CGI - concatenating strings & variables by Lori713

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