[MEDIUM] SS-2015-004: TreeDropdownField and TreeMultiSelectField XSS

PKSA-4b5m-tw4q-3fmq GHSA-qp29-wcc2-vmpc

Affected package: silverstripe/framework

Affected version: >=3.1.0,<=3.1.9

Reported by:
GitHub, FriendsOfPHP/security-advisories