Improper Check for Unusual or Exceptional Conditions in DOMPurify - #VU126315
Published: April 16, 2026
Vulnerability identifier: #VU126315
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-754
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cure53
Affected software:
DOMPurify
DOMPurify
Detailed vulnerability description
The vulnerability allows a remote attacker to execute arbitrary script in the parent document.
The vulnerability exists due to improper check for unusual or exceptional conditions in the IN_PLACE sanitization path when sanitizing a DOM element originating from a different window or realm. A remote attacker can cause the application to sanitize a crafted cross-window DOM element with IN_PLACE enabled to execute arbitrary script in the parent document.
Only the IN_PLACE DOM node path is affected. Exploitation requires the application to pass an element from a different window object, such as a same-origin iframe or opened window, and then render that element into the main document after sanitization.
Remediation
Install security update from vendor's website.