The issue is related to insufficient input validation in the DOMPurify JavaScript library, which can lead to a cross-site scripting (XSS) attack. This vulnerability allows a remote attacker to perform a cross-site scripting attack. DOMPurify is a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML, and SVG, and it was vulnerable to nesting-based mXSS.