VULNERABILITY INTELLIGENCE

CVE-2026-25543

CVSS score6.1 MEDIUM

EPSS probability0.27%

CISA KEVNot currently listed

Published2026-02-04

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Weakness classification

security-advisories@github.com: CWE-116
nvd@nist.gov: CWE-79

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Mitigation, Patch, Vendor Advisory
security-advisories@github.com — Product, Release Notes
security-advisories@github.com — Product, Release Notes