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.
CVSS 4.7EPSS 0.165%Risque 0.48
Voir la source- Publication
- 2026-07-23 14:18:06
- Versions concernées
- <=3.3.3
- Type
- Bibliothèque
- Dernière modification
- 2026-07-28 15:51:19
- Vecteur
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N