The AllowCrossRendererResourceLoad function in extensions/browser/urlrequestutil.cc in Google Chrome before 53.0.2785.89 on Windows and OS X and before 53.0.2785.92 on Linux does not properly use an extension's manifest.json webaccessibleresources field for restrictions on IFRAME elements, which makes it easier for remote attackers to conduct clickjacking attacks, and trick users into changing extension settings, via a crafted web site, a different vulnerability than CVE-2016-5162.