Security Advisory

CVE-2026-65904

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-23 13:16:22

Last updated 2026-07-24 21:35:25

Assigner VulnCheck

CVSS score 2.3

State PUBLISHED

Description

DOMPurify through 3.3.3 fails to sanitize DOM elements passed via IN_PLACE mode when the element originates from a different window/realm (e.g., an iframe's contentDocument). A cross-realm instanceof check in the private _isNode() function returns false for foreign-realm nodes, causing DOMPurify to stringify the element (yielding '[object HTMLDivElement]'), silently reset IN_PLACE to false, and return the unsanitized element unchanged with any XSS payloads intact.

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