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CVE-2026-66010

MEDIUM NVD
CVSS Score
6.1
Severity
MEDIUM
Source
NVD
Published
Jul 24, 2026
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.

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