#VU126316 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in DOMPurify
Published: April 16, 2026
Vulnerability identifier: #VU126316
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
DOMPurify
DOMPurify
Software vendor:
Cure53
Cure53
Description
The vulnerability allows a remote attacker to execute arbitrary script in the victim's browser.
The vulnerability exists due to improper neutralization of input during web page generation in DOMPurify sanitize() configuration handling when reusing a shared DOMPurify instance across sanitize() calls with ADD_ATTR or ADD_TAGS supplied first as a function predicate and later as an array. A remote attacker can submit crafted HTML to trigger stale predicate state and execute arbitrary script in the victim's browser.
The issue can bypass explicit FORBID_TAGS settings and affects cases where a shared instance is used across different sanitization contexts.
Remediation
Install security update from vendor's website.