Iframe XSS: postMessage, CSP, Sandboxing, & Clickjacking
Iframe XSS Explained: Trust Boundaries, Messages, and Embedded Content Iframe XSS isn’t one single bug class. It can refer to XSS inside framed content, unsafe srcdoc, user-controlled iframe sources, weak postMessage handling, over-trusted widgets, or parent pages that trust child frames too much. The fix starts with trust boundaries: control iframe sources, sandbox untrusted content, …
