Description
HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. In HtmlSanitizer before version 5.0.372, there is a possible XSS bypass if style tag is allowed. If you have explicitly allowed the `<style>` tag, an attacker could craft HTML that includes script after passing through the sanitizer. The default settings disallow the `<style>` tag so there is no risk if you have not explicitly allowed the `<style>` tag. The problem has been fixed in version 5.0.372.
Metrics
CVSS 3.1 6.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| mganss | HtmlSanitizer | < 5.0.372 |
References
- https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8Patch, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372Release Notes, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhvThird Party Advisory
- https://www.nuget.org/packages/HtmlSanitizer/Product, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9c7e2eb8Patch, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372Release Notes, Third Party Advisory
- https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhvThird Party Advisory
- https://www.nuget.org/packages/HtmlSanitizer/Product, Third Party Advisory
Timeline
- Published
- Jan 4, 2021
- Last modified
- Jun 17, 2026
- NVD status
- Modified