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CVE-2026-66010— DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING

Quick assessment

Affected
cure53 DOMPurify
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.

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 3.4.12之前版本存在跨站脚本漏洞，该漏洞源于CUSTOM_ELEMENT_HANDLING.tagNameCheck允许的自定义元素未执行afterSanitizeElements钩子，导致属性绕过应用程序安全策略，攻击者可以在自定义元素上保留敏感属性，随后将其重新注入innerHTML接收器，从而创建二阶跨站脚本小

CVSS 6.1 · Medium EPSS 0.18% · P8

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
cure53 DOMPurify < 3.4.12 affected
3.4.12 unaffected
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I. Basic Information for CVE-2026-66010

Vulnerability Information
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Vulnerability Title
DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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
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 3.4.12之前版本存在跨站脚本漏洞，该漏洞源于CUSTOM_ELEMENT_HANDLING.tagNameCheck允许的自定义元素未执行afterSanitizeElements钩子，导致属性绕过应用程序安全策略，攻击者可以在自定义元素上保留敏感属性，随后将其重新注入innerHTML接收器，从而创建二阶跨站脚本小
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

Vendor Product Affected Versions CPE Subscribe
cure53 DOMPurify 0 ~ 3.4.12 -

II. Public POCs for CVE-2026-66010

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III. Intelligence Information for CVE-2026-66010

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Vendor Advisories for CVE-2026-66010 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-66010

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