Search by 
contao/comments-bundle Security Advisories for 5.6.3 (1)
-
Cross-site scripting in the comments bundle (see GHSA-628f-v4f6-p37r)
Affected version: >=4.0.0,<5.3.50|>=5.4.0,<5.7.12
Reported by:
FriendsOfPHP/security-advisories