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CVE-2026-49978— DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content

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 3.4.7之前版本存在跨站脚本漏洞，该漏洞源于IN_PLACE清理过程中可能跳过<template>.content内元素附加的阴影内容，导致攻击者控制的事件处理程序、JavaScript URL或脚本在应用程序克隆并插入已清理模板时存活并执行。

AI Predicted 7.5 Difficulty: Easy EPSS 0.33% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
cure53 DOMPurify < 3.4.6 affected
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I. Basic Information for CVE-2026-49978

Vulnerability Information
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Vulnerability Title
DOMPurify IN_PLACE Sanitization Bypass via Attached Shadow Root Inside <template>.content
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA: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 3.4.7之前版本存在跨站脚本漏洞，该漏洞源于IN_PLACE清理过程中可能跳过<template>.content内元素附加的阴影内容，导致攻击者控制的事件处理程序、JavaScript URL或脚本在应用程序克隆并插入已清理模板时存活并执行。
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 < 3.4.6 -

II. Public POCs for CVE-2026-49978

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III. Intelligence Information for CVE-2026-49978

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Vendor Advisories for CVE-2026-49978 (1)

Vendor Pages for CVE-2026-49978 (1)

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

CVE-2026-47423 8.2 HIGH DOMPurify XSS via `selectedcontent` re-clone
CVE-2026-49459 6.1 MEDIUM DOMPurify: IN_PLACE mode preserves attributes of a clobbered root element, allowing XSS vi
CVE-2026-49458 6.1 MEDIUM DOMPurify: Cross-realm IN_PLACE sanitization leaves executable markup intact via realm-bou

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-49978

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