Medium severity4.7NVD Advisory· Published Jul 23, 2026· Updated Jul 28, 2026
CVE-2026-65904
CVE-2026-65904
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.
Affected products
2Patches
Vulnerability mechanics
References
2- github.com/cure53/DOMPurify/security/advisories/GHSA-4w3q-35jp-p934nvdExploitThird Party Advisory
- www.vulncheck.com/advisories/dompurify-before-cross-site-scripting-via-in-place-modenvdThird Party Advisory
News mentions
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