Improper access control in DOMPurify - CVE-2026-66010

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Main Vulnerability Database Vulnerabilities #VU137374

Improper access control in DOMPurify - CVE-2026-66010

Published: July 13, 2026 / Updated: September 14, 2026


Vulnerability identifier: #VU137374
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66010
CWE-ID: CWE-284
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary script code.

The vulnerability exists due to improper access control in the CUSTOM_ELEMENT_HANDLING sanitization logic when processing allowed custom elements. A remote attacker can supply specially crafted HTML content to execute arbitrary script code.

The bypass affects the afterSanitizeElements hook and the payload becomes executable only after a custom element writes sanitized data into innerHTML.


Affected software

DOMPurify
IBM Maximo Scheduler Optimization
Maximo Application Suite - Monitor Component
IBM Security QRadar Network Threat Analytics
Fedora
nextcloud

How to mitigate CVE-2026-66010

Install security update from vendor's website.

DOMPurify - update to 3.4.12
IBM Maximo Scheduler Optimization - addressed in versions 9.0.27, 9.1.16, 9.2.23
Maximo Application Suite - Monitor Component - addressed in versions 9.0.25, 9.1.15, 9.2.4
IBM Security QRadar Network Threat Analytics - update to 2.0.2
nextcloud - addressed in versions 34.0.3-1.el10_2, 34.0.3-1.el10_3, 34.0.3-1.fc44

External References

Related Security Bulletins