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…
Medium CVSS 4.7
Summary
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.
In-depth triage · Auto channel
No in-depth report has been generated yet (DR-003 v2 AI pipeline is under construction).
Affected products
- :
Sources
- NVD DATABASE
Original Links
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-4w3q-35jp-p934 Exploit
- https://www.vulncheck.com/advisories/dompurify-before-cross-site-scripting-via-in-place-mode Third Party Advisory
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-4w3q-35jp-p934 Exploit
Timeline
- nvd_ingest NVD