CVE-2026-65904 — DOMPurify through 3.3.3 Cross-Site Scripting via IN_PLACE mode
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 …
Published: 2026-07-23 · CVSS: 2.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7