Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-65904

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 5.0%
CVSS Severity
CVSS v3 Score 4.7
Products affected by CVE-2026-65904


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