[CRITICAL] SS-2018-014: Dangerous file types in allowed upload

PKSA-bgw4-m81v-y1gj GHSA-8v6m-7f5v-hhx6

Affected package: silverstripe/framework

Affected version: >=3.6.5,<3.6.6|>=4.0.3,<4.0.4|>=4.1.0,<4.1.1

Reported by:
GitHub, FriendsOfPHP/security-advisories