A vulnerability has been reported in ASP.NET, which can be exploited by malicous people to bypass the "Request Validation" security mechanism.
The "Request Validation" mechanism designed to protect against Cross-Site Scripting and SQL injection allows restricted tags when they include a NULL byte. However, this is a problem since some browsers (eg. Internet Explorer) ignore NULL bytes when parsing input, which may cause them to execute the content in the tags anyway.
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Subject: Microsoft ASP.NET Request Validation Bypass Vulnerability
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