CVE-2026-66010 DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into...

CVE-2026-66010

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into...

CVE-2026-66010 DOMPurify before 3.4.12 Hook Bypass via CUSTOM_ELEMENT_HANDLING

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into...

CVE-2026-66010

DOMPurify before 3.4.12 has a vulnerability where afterSanitizeElements is not executed for custom elements allowed by CUSTOM_ELEMENT_HANDLING.tagNameCheck, enabling attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements and later re-inj...

CVE-2026-66010

DOMPurify before 3.4.12 fails to execute afterSanitizeElements hook for custom elements allowed via CUSTOMELEMENTHANDLING.tagNameCheck, allowing attributes to bypass application security policies. Attackers can preserve sensitive attributes on custom elements that later re-inject them into...

NPM: DOMPurify: `CUSTOM_ELEMENT_HANDLING` bypasses `afterSanitizeElements` for allowed custom elements.

NPM: DOMPurify: CUSTOMELEMENTHANDLING bypasses afterSanitizeElements for allowed custom elements. vulnerability discovered by ? in WordPress Npm dompurify versions = 3.4.11...

DOMPurify: `CUSTOM_ELEMENT_HANDLING` bypasses `afterSanitizeElements` for allowed custom elements.

Summary There is a possible hook-policy inconsistency in DOMPurify 3.4.11 involving CUSTOMELEMENTHANDLING. When a custom element is allowed via CUSTOMELEMENTHANDLING.tagNameCheck, it appears that the element does not go through afterSanitizeElements in the same way as a normal element. As a resul...

Incomplete List of Disallowed Inputs

Overview dompurify is a DOM-only XSS sanitizer for HTML, MathML and SVG. Affected versions of this package are vulnerable to Incomplete List of Disallowed Inputs in the CUSTOMELEMENTHANDLING. An attacker can cause security-relevant attributes to be preserved on allowed custom elements by leveragi...

GHSA-C2J3-45GR-MQC4 DOMPurify: `CUSTOM_ELEMENT_HANDLING` bypasses `afterSanitizeElements` for allowed custom elements.

Summary There is a possible hook-policy inconsistency in DOMPurify 3.4.11 involving CUSTOMELEMENTHANDLING. When a custom element is allowed via CUSTOMELEMENTHANDLING.tagNameCheck, it appears that the element does not go through afterSanitizeElements in the same way as a normal element. As a resul...

PT-2026-64287

Name of the Vulnerable Software and Affected Versions DOMPurify versions prior to 3.4.12 Description DOMPurify fails to execute the afterSanitizeElements hook for custom elements that are permitted through CUSTOM ELEMENT HANDLING.tagNameCheck. This allows attributes to bypass application security...