SS-2015-027: HtmlEditor embed url sanitisation

PKSA-7xtp-kt8p-p95z

Affected package: silverstripe/framework

Affected version: >=3.0.0,<3.1.0|>=3.1.0,<3.2.0|>=3.2.0,<3.2.1

Reported by:
FriendsOfPHP/security-advisories