Security Advisory
CVE-2026-66010
6.1
MEDIUM
Vulnerability Description
DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.
Published Date
July 24, 2026
Official Source
NIST NVD Advisory