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CVE-2026-109344— DOMPurify from 3.4.13 before 3.4.16 DOM XSS via IN_PLACE afterSanitize Hooks

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.

DOMPurify 3.4.13 至 3.4.16 版本之前存在跨站脚本（XSS）漏洞。由于在 IN_PLACE 模式下， 或 钩子会剥离子树（subtrees），但未能对其中的内容进行适当的安全处理（即未能中和），从而导致该漏洞。攻击者可以在由这些钩子移除的包装元素内部提供带有 事件处理程序的恶意标记，使得这些事件处理程序在清理后的真实 DOM 中仍然处于激活状态，进而能够在受害者网站的上下文中执行恶意脚本。

CVSS 6.1 · Medium EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
cure53 DOMPurify 3.4.13< 3.4.16 affected
3.4.16 unaffected
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I. Basic Information for CVE-2026-109344

Vulnerability Information
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Vulnerability Title
DOMPurify from 3.4.13 before 3.4.16 DOM XSS via IN_PLACE afterSanitize Hooks
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify from 3.4.13 before 3.4.16 contains a cross-site scripting vulnerability because IN_PLACE mode fails to neutralize subtrees detached by afterSanitizeElements or afterSanitizeAttributes hooks. Attackers can supply markup with on* handlers inside a wrapper removed by such hooks, leaving handlers armed on the live DOM to execute script in the victim origin.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
cure53 DOMPurify 3.4.13 ~ 3.4.16 -

II. Public POCs for CVE-2026-109344

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-109344

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Vendor Advisories for CVE-2026-109344 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-109344

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