[HIGH] CVE-2020-9280: Folders migrated from 3.x may be unsafe to upload to

PKSA-mzkw-2yhz-1nzc CVE-2020-9280 GHSA-592m-4533-rxq9

Affected package: silverstripe/assets

Affected version: >=1.0.0,<1.4.7|>=1.5.0,<1.5.2

Reported by:
GitHub, FriendsOfPHP/security-advisories