Location bar spoofing via data URLs with malformed/invalid mediatypes

2016-08-02T00:00:00
ID MFSA2016-66
Type mozilla
Reporter Mozilla Foundation
Modified 2016-08-02T00:00:00

Description

Security researcher Firas Salem reported that decoding url-encoded values in data: urls for display leads to potential spoofing in the Location bar by using non-ASCII and emoji characters in a data: url's mediatype. This issue could result in the wrong URL being displayed as a location, which can mislead users to believe they are on a different site than the one loaded.