Improper access control in DOMPurify - #VU126319
Published: April 16, 2026
Vulnerability identifier: #VU126319
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: N/A
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Cure53
Affected software:
DOMPurify
DOMPurify
Detailed vulnerability description
The vulnerability allows a remote user to bypass tag filtering restrictions.
The vulnerability exists due to improper access control in the ADD_TAGS tag handling logic when processing sanitized HTML with both ADD_TAGS as a function and FORBID_TAGS enabled. A remote user can supply crafted markup using forbidden tags to bypass tag filtering restrictions.
Only applications that use ADD_TAGS in function form together with FORBID_TAGS are affected.
Remediation
Install security update from vendor's website.