[MEDIUM] SS-2016-006: Missing CSRF protection in login form

PKSA-pndp-7357-wkqq GHSA-pp7q-6j3f-74vj

Affected package: silverstripe/framework

Affected version: >=3.1.18,<3.1.19|>=3.2.3,<3.2.4|>=3.3.1,<3.3.2

Reported by:
GitHub, FriendsOfPHP/security-advisories