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Vulnerability record · CVE-2009-4074 · published 25 November 2009

CVE-2009-4074: Microsoft internet explorer vulnerability

Microsoft · Internet Explorer

The XSS Filter in Microsoft Internet Explorer 8 allows remote attackers to leverage the "response-changing mechanism" to conduct cross-site scripting (XSS) attacks against web sites that have no inherent XSS vulnerabilities, related to the details of output encoding and improper modification of an HTML attribute, aka "XSS Filter Script Handling Vulnerability."

4.3 CVSS 2.0 Medium EPSS 15% · top 3.4%
4.3CVSS 2.0 base score
15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
16 Jun 2026Last modified by NVD

Description

The XSS Filter in Microsoft Internet Explorer 8 allows remote attackers to leverage the "response-changing mechanism" to conduct cross-site scripting (XSS) attacks against web sites that have no inherent XSS vulnerabilities, related to the details of output encoding and improper modification of an HTML attribute, aka "XSS Filter Script Handling Vulnerability."

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://hackademix.net/2009/11/21/ies-xss-filter-creates-xss-vulnerabilities/
http://www.owasp.org/images/5/50/OWASP-Italy_Day_IV_Maone.pdf
http://www.securityfocus.com/bid/37135
http://www.theregister.co.uk/2009/11/20/internet_explorer_security_flaw/
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-002
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7715
http://hackademix.net/2009/11/21/ies-xss-filter-creates-xss-vulnerabilities/
http://www.owasp.org/images/5/50/OWASP-Italy_Day_IV_Maone.pdf
http://www.securityfocus.com/bid/37135
http://www.theregister.co.uk/2009/11/20/internet_explorer_security_flaw/
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-002
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7715

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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-2009-4074), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.