CVE-2026-65904
DOMPurify through 3.3.3 Cross-Site Scripting via IN_PLACE mode
CVSS Score
4.7
EPSS Score
0.2%
EPSS Percentile
5th
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.
| CWE | CWE-754 |
| Vendor | cure53 |
| Product | dompurify |
| Published | Jul 23, 2026 |
| Last Updated | Jul 24, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
cure53 / DOMPurify
0 ≤ 3.3.3
References
Credits
🔍 fg0x0