Only data that is used in external calls must be taint checked. For example, when a name is put in a cookie, just for fun, there's absolutely no reason to taint check it
Absolutely no reason to taint check? What if the name they give you contains "\r\n"? If you blindly copied that name into a Set-Cookie header, someone could insert arbitrary HTTP headers and HTML content into your output with a cross-site scripting attack.
you should think about encoding it, though
Encoding will solve this problem in most cases. CGI.pm automatically url-escapes cookie contents, which is yet another reason to always use it.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
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<li> <nbsp> <ol> <p>
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<sub> <sup> <table>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
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taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
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Want more info? How to link or
or How to display code and escape characters
are good places to start.