A Cross site request forgery (CSRF) vulnerability was discovered in FeiFeiCMS v4.1.190209, which allows attackers to create administrator accounts via /index.php?s=Admin-Admin-Insert.

FeiFeiCMS 4.1.190209 allows remote attackers to upload and execute arbitrary PHP code by visiting index.php?s=Admin-Index to modify the set of allowable file extensions, as demonstrated by adding php to the default jpg,gif,png,jpeg setting, and then using the "add article" feature.