CVE-2026-49459

Medium

Description

DOMPurify 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 preserve event-handler attributes on an attacker-controlled <form> root when a descendant name clobbered properties checked by _isClobbered, because _forceRemove no-opped on the parent-less root and _sanitizeAttributes returned early. This issue is fixed in version 3.4.6.

SeverityMedium

CVSS6.1

Exploit probability—

ProductCure53 Dompurify

PublishedJul 14, 2026

First seenJul 14, 2026

Weakness typeCWE-79Cross-site scripting (XSS)CWE-693CWE-693 CWE-1321Prototype pollution

How to fix

Update

cure53 dompurify3.4.6 or later
dompurify3.4.6 or later

Affected products

Product	Affected versions	Fixed in
cure53 dompurify	v < 3.4.6	3.4.6
dompurifynpm	v < 3.4.6	3.4.6

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