Mozilla Firefox before 44.0.2 does not properly restrict the interaction between Service Workers and plugins, which allows remote attackers to bypass the Same Origin Policy via a crafted web site that triggers spoofed responses to requests that use NPAPI, as demonstrated by a request for a crossdomain.xml file.
http://lists.opensuse.org/opensuse-updates/2016-02/msg00102.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00142.html
http://www.mozilla.org/security/announce/2016/mfsa2016-13.html
http://www.securitytracker.com/id/1035007
http://www.ubuntu.com/usn/USN-2893-1
Source: MITRE
Published: 2016-02-13
Updated: 2016-12-06
Type: CWE-264
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 8.8
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.8
Severity: HIGH