CVE-2008-3843: Microsoft .NET Framework

Medium severity, CVSS 4.3. EPSS: 22% chance of exploitation in the next 30 days.

Request Validation (aka the ValidateRequest filters) in ASP.NET in Microsoft .NET Framework with 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 tilde slash) sequence followed by a crafted STYLE element.

Affected products

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

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