CVE-2026-66010
Last modified
CVE-2026-66010 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.. EPSS estimates a 0.17% chance of exploitation in the next 30 days.
Description
DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOM_ELEMENT_HANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into innerHTML sinks, creating second-order XSS gadgets.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Cure53 | Dompurify | < 3.4.12 |
References
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4Exploit, Vendor Advisory
- https://github.com/cure53/DOMPurify/security/advisories/GHSA-c2j3-45gr-mqc4Exploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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