[MEDIUM] SS-2015-026: Form field validation message XSS vulnerability

PKSA-mjkn-vqsc-z7x7 GHSA-52cx-hpc5-cxwc

Affected package: silverstripe/framework

Affected version: >=3.0.0,<3.1.0|>=3.1.0,<3.1.16|>=3.2.0,<3.2.1

Reported by:
GitHub, FriendsOfPHP/security-advisories