QwikSec

Security Database

CVE

CWE

Training

CVE-2026-25543

Published: Feb 4, 2026

Modified: Feb 5, 2026

PUBLISHED

Description

HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. Prior to versions 9.0.892 and 9.1.893-beta, if the template tag is allowed, its contents are not sanitized. The template tag is a special tag that does not usually render its contents, unless the shadowrootmode attribute is set to open or closed. This issue has been patched in versions 9.0.892 and 9.1.893-beta.

Vendor	Product	Versions
mganss	HtmlSanitizer	affected `< 9.0.892` affected `< 9.1.893-beta`

Weaknesses (CWE)

References

https://github.com/mganss/HtmlSanitizer/security/advisories/GHSA-j92c-7v7g-gj3f

x_refsource_CONFIRM

https://github.com/mganss/HtmlSanitizer/commit/0ac53dca30ddad963f2b243669a5066933d82b81

x_refsource_MISC

https://www.nuget.org/packages/HtmlSanitizer/9.0.892

x_refsource_MISC

https://www.nuget.org/packages/HtmlSanitizer/9.1.893-beta

x_refsource_MISC

Security Training

Train your team to recognize and prevent security threats with our comprehensive security awareness program.

Vulnerability Scanning

Discover vulnerabilities in your applications and infrastructure before attackers do.