CVE-2008-3842: Microsoft .NET Framework

Medium severity, CVSS 4.3. EPSS: 20.4% chance of exploitation in the next 30 days.

Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework without the MS07-040 update does not properly detect dangerous client input, which allows remote attackers to conduct cross-site scripting (XSS) attacks, as demonstrated by a query string containing a "</" (less-than slash) sequence.

Affected products

• Microsoft .NET Framework: version 2.0 only; version 1.1 only; version 1.0 only

Published 2008-08-27. Last modified 2026-06-16.