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CVE-2026-116538— HtmlSanitizer before 9.2.1039 XSS via SanitizeDom Body and HTML Attributes

Quick assessment

Affected
mganss HtmlSanitizer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在版本 9.2.1039 之前的 HtmlSanitizer，以及 10.0 预览版中低于 10.0.1037-beta 的版本，存在跨站脚本（XSS）漏洞。该漏洞源于 方法从未对 和 包装元素上的属性进行净化。攻击者可以提交包含第二个 或 标签的输入，这些标签携带如 等事件处理器；当应用程序渲染序列化后的文档或 的外层 HTML 时，恶意脚本将被执行。

CVSS 4.7 · Medium EPSS 0.29% · P21

Affected Version Matrix 2

VendorProduct Version RangeStatus
mganss HtmlSanitizer < 9.2.1039 affected
10.0.0-beta< 10.0.1037-beta affected
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I. Basic Information for CVE-2026-116538

Vulnerability Information
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Vulnerability Title
HtmlSanitizer before 9.2.1039 XSS via SanitizeDom Body and HTML Attributes
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
mganss HtmlSanitizer 0 ~ 9.2.1039 -

II. Public POCs for CVE-2026-116538

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-116538

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Patches & Fixes for CVE-2026-116538 (2)

Vendor Advisories for CVE-2026-116538 (1)

Security Blog Posts for CVE-2026-116538 (1)

Vendor Pages for CVE-2026-116538 (2)

IV. Related Vulnerabilities

Same product: HtmlSanitizer
Same vendor: mganss
Same weakness: CWE-79