GHSA-V9JR-RG53-9PGP DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback

Summary DOMPurify versions 3.0.1 through 3.3.3 latest are vulnerable to a prototype pollution-based XSS bypass. When an application uses DOMPurify.sanitize with the default configuration no CUSTOMELEMENTHANDLING option, a prior prototype pollution gadget can inject permissive tagNameCheck and...