When choosing a site-isolated process for a document loaded from a data: URL that was the result of a redirect, Firefox would load that document in the same process as the site that issued the redirect. This bypassed the site-isolation protections against Spectre-like attacks on sites that host an "open redirect". Firefox no longer follows HTTP redirects to data: URLs. This vulnerability affects Firefox < 114.
{ "availability": "No subscription required", "binaries": [ { "binary_name": "firefox", "binary_version": "114.0+build3-0ubuntu0.20.04.1" }, { "binary_name": "firefox-dev", "binary_version": "114.0+build3-0ubuntu0.20.04.1" }, { "binary_name": "firefox-geckodriver", "binary_version": "114.0+build3-0ubuntu0.20.04.1" }, { "binary_name": "firefox-mozsymbols", "binary_version": "114.0+build3-0ubuntu0.20.04.1" } ] }