When in an endless loop, a website specifying a custom cursor using CSS could make it look like the user is interacting with the user interface, when they are not. This could lead to a perceived broken state, especially when interactions with existing browser dialogs and warnings do not work. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1. Source: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15654 Reference (s):
- https://bugzilla.mozilla.org/show_bug.cgi?id=1648333
- URL: https://bugzilla.mozilla.org/show_bug.cgi?id=1648333
- https://www.mozilla.org/security/advisories/mfsa2020-30/
- URL: https://www.mozilla.org/security/advisories/mfsa2020-30/
- https://www.mozilla.org/security/advisories/mfsa2020-32/