Endpoint Vulnerability

Dragging and dropping images exposes final URL after redirects


Security researcher Mario Gomes reported that when a previously loaded image on a page is drag and dropped into content after a redirect, the redirected URL is available to scripts. This is a violation of the Fetch specification's defined behavior for 'Atomic HTTP redirect handling' which states that redirected URLs are not exposed to any APIs. This can allow for information leakage.

Affected Products

Firefox,Firefox ESR