Cross Site Scripting

DOMPurify is vulnerable to Cross-Site Scripting XSS. The vulnerability is due to improper handling of cross-realm DOM elements in INPLACE mode, where elements from a different window or iframe bypass sanitization, allowing attackers to preserve and execute malicious JavaScript...

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 INPLACE 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...

PT-2026-63990

Name of the Vulnerable Software and Affected Versions DOMPurify versions 3.0.0 through 3.3.3 Description When using the IN PLACE mode, the software fails to sanitize DOM elements that originate from a different window or realm, such as an iframe's contentDocument. This occurs because a cross-real...