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CVE-2026-40301— rhukster/dom-sanitizer: SVG <style> tag allows CSS injection via unfiltered url() and @import directives

Quick assessment

Affected
rhukster dom-sanitizer
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.

DOMSanitizer是Andy Miller个人开发者的一个DOM（文档对象模型）的安全性操作或过滤器。 DOMSanitizer 1.0.10之前版本存在安全漏洞，该漏洞源于对SVG中style元素内容检查不足，可能导致浏览器向攻击者控制的主机发起HTTP请求。

CVSS 4.7 · Medium EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys
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I. Basic Information for CVE-2026-40301

Vulnerability Information
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Vulnerability Title
rhukster/dom-sanitizer: SVG <style> tag allows CSS injection via unfiltered url() and @import directives
Source: CVE Program / CVE List V5
Vulnerability Description
DOMSanitizer is a DOM/SVG/MathML Sanitizer for PHP 7.3+. Prior to version 1.0.10, DOMSanitizer::sanitize() allows <style> elements in SVG content but never inspects their text content. CSS url() references and @import rules pass through unfiltered, causing the browser to issue HTTP requests to attacker-controlled hosts when the sanitized SVG is rendered. Version 1.0.10 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/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
DOMSanitizer 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DOMSanitizer是Andy Miller个人开发者的一个DOM（文档对象模型）的安全性操作或过滤器。 DOMSanitizer 1.0.10之前版本存在安全漏洞，该漏洞源于对SVG中style元素内容检查不足，可能导致浏览器向攻击者控制的主机发起HTTP请求。
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
rhukster dom-sanitizer < 1.0.10 -

II. Public POCs for CVE-2026-40301

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III. Intelligence Information for CVE-2026-40301

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Vendor Advisories for CVE-2026-40301 (1)

IV. Related Vulnerabilities

Same weakness: CWE-79

V. Comments for CVE-2026-40301

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