CVE-2026-25543
Medium · 6.1CVSS
6.1
EPSS
0.4%
Published
Feb 4, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| NuGet | HtmlSanitizer | 0 | 9.0.892 |
| NuGet | HtmlSanitizer | 9.1.878-beta | 9.1.893-beta |
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