Medium severity · published Jul 23, 2026
CVE-2026-65904
DOMPurify through 3.3.3 Cross-Site Scripting via IN_PLACE mode
4.7
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 18% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DO
DOMPurify · cure53
through 3.3.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-65904
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-65904
Exploit
https://github.com/cure53/DOMPurify/security/advisories/GHSA-4w3q-35jp-p934
Third Party Advisory
https://www.vulncheck.com/advisories/dompurify-before-cross-site-scripting-via-in-place-mode
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