Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Htmlsanitizer Project | Htmlsanitizer | < 5.0.372 |
Related Weaknesses (CWE)
References
- https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9PatchThird Party Advisory
- https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372Release NotesThird Party Advisory
- https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhvThird Party Advisory
- https://www.nuget.org/packages/HtmlSanitizer/ProductThird Party Advisory
- https://github.com/mganss/HtmlSanitizer/commit/a3a7602a44d4155d51ec0fbbedc2a49e9PatchThird Party Advisory
- https://github.com/mganss/HtmlSanitizer/releases/tag/v5.0.372Release NotesThird Party Advisory
- https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-8j9v-h2vp-2hhvThird Party Advisory
- https://www.nuget.org/packages/HtmlSanitizer/ProductThird Party Advisory
FAQ
What is CVE-2020-26293?
CVE-2020-26293 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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...
How severe is CVE-2020-26293?
CVE-2020-26293 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-26293?
Check the references section above for vendor advisories and patch information. Affected products include: Htmlsanitizer Project Htmlsanitizer.