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CVE-2026-65904— DOMPurify through 3.3.3 Cross-Site Scripting via IN_PLACE mode

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 3.3.3及之前版本存在异常处理不当漏洞，该漏洞源于当元素来自不同窗口/域（如iframe的contentDocument）时，私有函数_isNode()中的跨域instanceof检查对外域节点返回false，导致IN_PLACE模式未能对DOM元素进行清理，最终返回未清理的元素并保留XSS有效载荷，容易受到跨站脚本攻

CVSS 4.7 · Medium EPSS 0.27% · P17

Affected Version Matrix 1

VendorProduct Version RangeStatus
cure53 DOMPurify ≤ 3.3.3 affected
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I. Basic Information for CVE-2026-65904

Vulnerability Information
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Vulnerability Title
DOMPurify through 3.3.3 Cross-Site Scripting via IN_PLACE mode
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify through 3.3.3 fails to sanitize DOM elements passed via IN_PLACE mode when the element originates from a different window/realm (e.g., an iframe's contentDocument). A cross-realm instanceof check in the private _isNode() function returns false for foreign-realm nodes, causing DOMPurify to stringify the element (yielding '[object HTMLDivElement]'), silently reset IN_PLACE to false, and return the unsanitized element unchanged with any XSS payloads intact.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
cure53 DOMPurify 异常处理不当漏洞
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 3.3.3及之前版本存在异常处理不当漏洞，该漏洞源于当元素来自不同窗口/域（如iframe的contentDocument）时，私有函数_isNode()中的跨域instanceof检查对外域节点返回false，导致IN_PLACE模式未能对DOM元素进行清理，最终返回未清理的元素并保留XSS有效载荷，容易受到跨站脚本攻
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 ~ 3.3.3 -

II. Public POCs for CVE-2026-65904

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III. Intelligence Information for CVE-2026-65904

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Vendor Advisories for CVE-2026-65904 (1)

News Coverage for CVE-2026-65904 (1)

Same Patch Batch · cure53 · 2026-07-23 · 11 CVEs total

CVE-2026-65898 7.2 HIGH DOMPurify before 3.4.11 Permanent Attribute Allowlist Pollution via setConfig
CVE-2026-65899 6.1 MEDIUM DOMPurify before 3.4.9 Trusted Types Policy State Contamination
CVE-2026-65901 6.1 MEDIUM DOMPurify 3.4.6 Cross-Site Scripting via IN_PLACE nodeName
CVE-2026-65900 6.1 MEDIUM DOMPurify before 3.4.8 Template Expression Injection via RETURN_DOM
CVE-2026-65912 6.1 MEDIUM DOMPurify before 3.3.2 URI Validation Bypass via ADD_ATTR
CVE-2026-65913 6.1 MEDIUM DOMPurify before 3.3.2 Prototype Pollution via USE_PROFILES
CVE-2026-65911 6.1 MEDIUM DOMPurify before 3.4.0 XSS via ADD_ATTR/ADD_TAGS State Leakage
CVE-2026-65903 6.1 MEDIUM DOMPurify before 3.4.0 ADD_TAGS Function Bypasses FORBID_TAGS
CVE-2026-65902 6.1 MEDIUM DOMPurify before 3.4.7 Hook Mutation Pollution via allowedTags
CVE-2026-65914 5.3 MEDIUM DOMPurify before 3.3.2 Mutation XSS via Re-Contextualization

IV. Related Vulnerabilities

Same product: DOMPurify
Same vendor: cure53
Same weakness: CWE-754

V. Comments for CVE-2026-65904

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