Is Microsoft Multimedia Redirection safe?

Microsoft Multimedia Redirection bridges browser audio/video to a native OS host and shares internal port identifiers across page iframes without origin restrictions.

The extension injects content scripts on all pages to route multimedia streams from web applications to a local native messaging host. It tracks iframe relationships and shares internal native port IDs and page titles with child iframes using wildcard postMessage targeting, meaning any cross-origin iframe on the page can receive these identifiers. A cross-origin iframe can also spoof routing messages back to the parent page, corrupting the extension's native port mapping for that tab.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.