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CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-25543

HtmlSanitizer has a bypass via template tag

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

mganss HtmlSanitizer

  • < 9.0.892affected
  • < 9.1.893-betaaffected

References