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CVE-2026-116538

HtmlSanitizer before 9.2.1039 XSS via SanitizeDom Body and HTML Attributes

HtmlSanitizer before 9.2.1039 and 10.0 prereleases before 10.0.1037-beta contains a cross-site scripting vulnerability because SanitizeDom(string) never sanitizes attributes on the html and body wrapper elements. Attackers can supply input with a second body or html tag carrying event handlers like onload, executing script when applications render serialized document or body outer HTML.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Htmlsanitizer Project Mganss
Products
Htmlsanitizer Htmlsanitizer
CVE-2026-25543

HtmlSanitizer has a bypass via template tag

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.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Htmlsanitizer Project Mganss
Products
Htmlsanitizer Htmlsanitizer
CVE-2023-44390

HtmlSanitizer vulnerable to Cross-site Scripting in Foreign Content

HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. The vulnerability occurs in configurations where foreign content is allowed, i.e. either `svg` or `math` are in the list of allowed elements. In the case an application sanitizes user input with a vulnerable configuration, an attacker could bypass the sanitization and inject arbitrary HTML, including JavaScript code. Note that in the default configuration the vulnerability is not present. The vulnerability has been fixed in versions 8.0.723 and 8.1.722-beta (preview version).

CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Vendors
Htmlsanitizer Project
Products
Htmlsanitizer
CVE-2020-26293

Possible XSS bypass if style tag is allowed

HtmlSanitizer is a .NET library for cleaning HTML fragments and documents from constructs that can lead to XSS attacks. In HtmlSanitizer before version 5.0.372, there is a possible XSS bypass if style tag is allowed. If you have explicitly allowed the `<style>` tag, an attacker could craft HTML that includes script after passing through the sanitizer. The default settings disallow the `<style>` tag so there is no risk if you have not explicitly allowed the `<style>` tag. The problem has been fixed in version 5.0.372.

CVSS 3.1 · 6.1 Medium EPSS 1.0% KEV · Not listed
Vendors
Htmlsanitizer Project
Products
Htmlsanitizer