CVE-2026-49458 | DOMPurify is a DOM-only cross-site scripting sanitizer for H… | CVSS 6.1 MEDIUM

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.6, DOMPurify.sanitize(node, { IN_PLACE: true }) accepted same-origin foreign-realm DOM nodes while follow-on checks used parent-realm constructors, causing instanceof checks for forms, named node maps, document fragments, and elements to fail and skip clobber, template-content, and shadow-DOM sanitization branches so executable markup could survive. This issue is fixed in version 3.4.6.

Metadata

CVE ID: CVE-2026-49458
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-05-30 02:43 UTC
Published: 2026-07-14 19:58 UTC
Last updated: 2026-07-15 13:03 UTC
Primary CWE: CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product: cure53 / DOMPurify
Sources: cve.org · NVD

Severity & Metrics

6.1 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

SSVC — CISA Coordinator

Exploitation: PoC
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
cure53	DOMPurify	—	< 3.4.6

Weakness (CWE)

CWE	Source	Description
CWE-501	cna	CWE-501: Trust Boundary Violation
CWE-693	cna	CWE-693: Protection Mechanism Failure
CWE-79	cna	CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.1	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

References (3)

https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8 https://github.com/cure53/DOMPurify/security/advisories/GHSA-hpcv-96wg-7vj8
https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae https://github.com/cure53/DOMPurify/commit/bb7739e5bccec7e1ab3dae3f3e42d02db3acaaae
https://github.com/cure53/DOMPurify/releases/tag/3.4.6 https://github.com/cure53/DOMPurify/releases/tag/3.4.6