Response discrepancy in the login and password reset forms in SilverStripe CMS before 3.5.5 and 3.6.x before 3.6.1 allows remote attackers to enumerate users via timing attacks.
https://github.com/advisories/GHSA-fwhr-g5r4-xgxf
https://www.silverstripe.org/download/security-releases/ss-2017-005