CVE-2026-49459: CURE53 Dompurify

Medium severity, CVSS 6.1. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• CURE53 Dompurify: before 3.4.6 (fixed in 3.4.6)

Published 2026-07-14. Last modified 2026-07-21.