WebExtensions bundled with embedded experiments were not correctly checked for proper authorization. This allowed a malicious WebExtension to gain full browser permissions. This vulnerability affects Firefox ESR < 60.1 and Firefox < 61.
http://www.securityfocus.com/bid/104561
http://www.securitytracker.com/id/1041193
https://bugzilla.mozilla.org/show_bug.cgi?id=1454909
https://security.gentoo.org/glsa/201810-01
https://usn.ubuntu.com/3705-1/
Source: MITRE
Published: 2018-10-18
Updated: 2019-10-03
Type: CWE-863
Base Score: 7.5
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 10
Severity: HIGH
Base Score: 9.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 3.9
Severity: CRITICAL