Remote Yes

Type Access restriction bypass

Description

Sites can bypass security checks on permissions to install lightweight themes in Firefox before 60.0 and Thunderbird before 52.8, by manipulating the baseURI property of the theme element. This could allow a malicious site to install a theme without user interaction which could contain offensive or embarrassing images.

AVG-707 thunderbird 52.7.0-2 52.8.0-1 Critical Fixed

AVG-693 firefox 59.0.2-3 60.0-1 Critical Fixed

21 May 2018 ASA-201805-21 AVG-707 thunderbird Critical multiple issues

13 May 2018 ASA-201805-10 AVG-693 firefox Critical multiple issues

https://www.mozilla.org/en-US/security/advisories/mfsa2018-11/#CVE-2018-5168
https://bugzilla.mozilla.org/show_bug.cgi?id=1449548