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CVE-2026-75838— DOMPurify before 3.4.13 Cross-Site Scripting via IN_PLACE hook

Quick assessment

Affected
cure53 DOMPurify
Exploitation
Public or AI PoC available; prioritize validation
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公司开源的一款净化HTML以防范跨站脚本攻击的客户端库。 Cure53 DOMPurify 3.4.13之前版本存在跨站脚本漏洞，该漏洞源于IN_PLACE净化中元素移除钩子未能中和分离的子树，可能导致跨站脚本攻击，攻击者可在净化完成后执行事件处理程序。

CVSS 5.1 · Medium EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProduct Version RangeStatus
cure53 DOMPurify < 3.4.13 affected
3.4.13 unaffected
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I. Basic Information for CVE-2026-75838

Vulnerability Information
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Vulnerability Title
DOMPurify before 3.4.13 Cross-Site Scripting via IN_PLACE hook
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify before 3.4.13 contains a cross-site scripting vulnerability in IN_PLACE sanitization where element-removal hooks fail to neutralize detached subtrees. Attackers can supply HTML with event handlers on descendant elements that execute after sanitization completes, even though the returned root appears clean.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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公司开源的一款净化HTML以防范跨站脚本攻击的客户端库。 Cure53 DOMPurify 3.4.13之前版本存在跨站脚本漏洞，该漏洞源于IN_PLACE净化中元素移除钩子未能中和分离的子树，可能导致跨站脚本攻击，攻击者可在净化完成后执行事件处理程序。
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 ~ 3.4.13 -

II. Public POCs for CVE-2026-75838

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: after IN_PLACE sanitize the removed-element subtree is not neutralized — handler onmouseover with PROOF_e59fb5bf910332a0 still live on attached subtree
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 3765 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2026-75838

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Vendor Advisories for CVE-2026-75838 (2)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-75838

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