WebSheet in Apple iOS before 9.2.1 allows remote attackers to read or write to cookies by operating a crafted captive portal.
https://support.apple.com/HT205732
https://euvd.enisa.europa.eu/vulnerability/EUVD-2016-2825
http://www.securitytracker.com/id/1034737
http://lists.apple.com/archives/security-announce/2016/Jan/msg00002.html