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Vulnerability record · CVE-2008-3842 · published 27 August 2008

CVE-2008-3842: Microsoft .net framework cross-site scripting vulnerability

Microsoft · .Net Framework

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.

4.3 CVSS 2.0 Medium EPSS 20% · top 2.6% CWE-79 · Cross-site scripting
4.3CVSS 2.0 base score
20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
16 Jun 2026Last modified by NVD

Description

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.

AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://securityreason.com/securityalert/4193 Third Party Advisory
http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf Broken Link
http://www.securityfocus.com/archive/1/495667/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/44741
http://securityreason.com/securityalert/4193 Third Party Advisory
http://www.procheckup.com/PDFs/bypassing-dot-NET-ValidateRequest.pdf Broken Link
http://www.securityfocus.com/archive/1/495667/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/44741

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2008-3842), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.