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CVE-2026-41239— DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM 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.

DOMPurify是Cure53个人开发者的一款使用JavaScript编写的，用于HTML、MathML和SVG的DOM（文档对象模型）。 DOMPurify 1.0.10版本至3.4.0之前版本存在跨站脚本漏洞，该漏洞源于SAFE_FOR_TEMPLATES在RETURN_DOM或RETURN_DOM_FRAGMENT模式下无法正确清理模板表达式，导致XSS攻击。

CVSS 6.8 · Medium EPSS 0.41% · P34
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I. Basic Information for CVE-2026-41239

Vulnerability Information
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Vulnerability Title
DOMPurify has a SAFE_FOR_TEMPLATES bypass in RETURN_DOM mode
Source: CVE Program / CVE List V5
Vulnerability Description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Starting in version 1.0.10 and prior to version 3.4.0, `SAFE_FOR_TEMPLATES` strips `{{...}}` expressions from untrusted HTML. This works in string mode but not with `RETURN_DOM` or `RETURN_DOM_FRAGMENT`, allowing XSS via template-evaluating frameworks like Vue 2. Version 3.4.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/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
DOMPurify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DOMPurify是Cure53个人开发者的一款使用JavaScript编写的，用于HTML、MathML和SVG的DOM（文档对象模型）。 DOMPurify 1.0.10版本至3.4.0之前版本存在跨站脚本漏洞，该漏洞源于SAFE_FOR_TEMPLATES在RETURN_DOM或RETURN_DOM_FRAGMENT模式下无法正确清理模板表达式，导致XSS攻击。
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 >= 1.0.10, < 3.4.0 -

II. Public POCs for CVE-2026-41239

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III. Intelligence Information for CVE-2026-41239

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Vendor Advisories for CVE-2026-41239 (1)

Vendor Pages for CVE-2026-41239 (1)

Same Patch Batch · cure53 · 2026-04-23 · 3 CVEs total

CVE-2026-41238 6.9 MEDIUM DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback
CVE-2026-41240 DOMPurify: FORBID_TAGS bypassed by function-based ADD_TAGS predicate (asymmetry with FORBI

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-41239

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