[MEDIUM] XSS vulnerability with unsafe link protocols

PKSA-g6p7-7rfc-zbp2 CVE-2018-20583 GHSA-qx76-c53f-5c7q

Affected package: league/commonmark

Affected version: >=0.15.6,<0.18.1

Reported by:
GitHub, FriendsOfPHP/security-advisories