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CVE-2026-41238— DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback

CVSS 6.9 · Medium EPSS 0.04% · P11
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I. Basic Information for CVE-2026-41238

Vulnerability Information
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Vulnerability Title
DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback
Source: NVD (National Vulnerability Database)
Vulnerability Description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
Vulnerability Title
DOMPurify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DOMPurify是Cure53个人开发者的一款使用JavaScript编写的，用于HTML、MathML和SVG的DOM（文档对象模型）。 DOMPurify 3.0.1版本至3.3.3版本存在跨站脚本漏洞，该漏洞源于基于原型污染的XSS绕过，允许任意自定义元素和属性通过清理。
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
cure53DOMPurify >= 3.0.1, < 3.4.0 -

II. Public POCs for CVE-2026-41238

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III. Intelligence Information for CVE-2026-41238

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Same Patch Batch · cure53 · 2026-04-23 · 3 CVEs total

CVE-2026-412396.8 MEDIUMDOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode
CVE-2026-41240DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBI

IV. Related Vulnerabilities

Same product: DOMPurify
Same vendor: cure53
Same weakness: CWE-79

V. Comments for CVE-2026-41238

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