Security Advisory

CVE-2026-41238

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-04-23 14:43:17

Last updated 2026-04-23 16:22:34

Assigner GitHub_M

CVSS score 6.9

State PUBLISHED

Description

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses `DOMPurify.sanitize()` with the default configuration (no `CUSTOM_ELEMENT_HANDLING` option), a prior prototype pollution gadget can inject permissive `tagNameCheck` and `attributeNameCheck` regex values into `Object.prototype`, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.

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