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Vulnerability record · CVE-2026-49978 · published 14 July 2026

CVE-2026-49978: Cure53 dompurify cross-site scripting vulnerability

Cure53 · Dompurify

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.

6.3 CVSS 4.0 Medium EPSS 0.40% · top 67.9% CWE-79 · Cross-site scripting
6.3CVSS 4.0 base score
0.40%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
21 Jul 2026Last modified by NVD

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/cure53/DOMPurify/commit/ca30f070c360df162a3e3848e80e6fd3c9e74bff Patch
https://github.com/cure53/DOMPurify/releases/tag/3.4.7 Release Notes
https://github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwq Vendor AdvisoryExploit
https://github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwq Vendor AdvisoryExploit

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2024-48910Cure53 dompurify prototype pollution vulnerabilityDOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify was vulnerable to prototype pollution. This vuln…EPSS 1.2%8.2CVE-2026-47423Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. In 3.4.4, DOMPurify allowed selectedcontent by default, allowing br…EPSS 0.41%6.1CVE-2026-49458Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accept…EPSS 0.40%6.1CVE-2026-49459Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(root, { IN_PLACE: true }) could …EPSS 0.37%6.1CVE-2025-26791Cure53 dompurify cross-site scripting vulnerabilityDOMPurify before 3.2.4 has an incorrect template literal regular expression, sometimes leading to mutation cross-site scripting (mXSS).EPSS 0.61%6.1CVE-2024-47875Cure53 dompurify cross-site scripting vulnerabilityDOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMpurify was vulnerable to nesting-based mXSS. This vulne…EPSS 1.1%6.1CVE-2024-45801Cure53 dompurify inefficient regular expression (redos) vulnerabilityDOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. It has been discovered that malicious HTML using special n…EPSS 0.89%6.1CVE-2019-25155Cure53 dompurify open redirect vulnerabilityDOMPurify before 1.0.11 allows reverse tabnabbing in demos/hooks-target-blank-demo.html because links lack a 'rel="noopener noreferrer"' attribute.EPSS 0.51%

Source: NIST National Vulnerability Database (record CVE-2026-49978), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.