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CVE-2026-47423— DOMPurify XSS via `selectedcontent` re-clone

CVSS 8.2 · High EPSS 0.27% · P19

Affected Version Matrix 1

VendorProductVersion RangeStatus
cure53DOMPurify>= 3.4.4, < 3.4.5affected
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I. Basic Information for CVE-2026-47423

Vulnerability Information
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Vulnerability Title
DOMPurify XSS via `selectedcontent` re-clone
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing browsers to re-clone an XSS payload after sanitization so that unsanitized markup inside <selectedcontent> is returned. This issue is fixed in version 3.4.5.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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
Vulnerability Title
Cure53 DOMPurify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cure53 DOMPurify是Cure53公司开源的一款使用JavaScript编写的,用于HTML、MathML和SVG的DOM(文档对象模型)。 Cure53 DOMPurify 3.4.4版本及之前版本存在跨站脚本漏洞，该漏洞源于默认允许selectedcontent，导致浏览器在清理后重新克隆XSS有效载荷，使<selectedcontent>中的未清理标记被返回，容易受到跨站脚本攻击。
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
cure53DOMPurify >= 3.4.4, < 3.4.5 -

II. Public POCs for CVE-2026-47423

#POC DescriptionSource LinkShenlong Link
AI-Generated POCVerified env Premium
Qwen3.6-35B-A3B · 6881 chars
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III. Intelligence Information for CVE-2026-47423

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Patches & Fixes for CVE-2026-47423 (2)

Vendor Advisories for CVE-2026-47423 (1)

Same Patch Batch · cure53 · 2026-07-14 · 4 CVEs total

CVE-2026-494596.1 MEDIUMDOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS vi
CVE-2026-494586.1 MEDIUMDOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bou
CVE-2026-49978DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-47423

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