CVE-2026-49978: 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 3.4.7, 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.

Affected products

• CURE53 Dompurify: before 3.4.7 (fixed in 3.4.7)

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