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I. Basic Information for CVE-2026-25543
Vulnerability Information

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Vulnerability Title
HtmlSanitizer has a bypass via template tag
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
对输出编码和转义不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
HTMLSanitizer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HTMLSanitizer是JuliaHub开源的一个HTML格式化软件。 HTMLSanitizer 9.0.892之前版本和9.1.893-beta之前版本存在安全漏洞,该漏洞源于允许template标签时未清理其内容,可能导致跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
mganssHtmlSanitizer < 9.0.892 -
II. Public POCs for CVE-2026-25543
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III. Intelligence Information for CVE-2026-25543
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IV. Related Vulnerabilities
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