/panel/uploads
in Subrion CMS 4.2.1 allows remote attackers to execute arbitrary PHP code via a .pht or .phar file, because the .htaccess file omits these.
packetstormsecurity.com/files/162591/Subrion-CMS-4.2.1-Shell-Upload.html
packetstormsecurity.com/files/173998/Intelliants-Subrion-CMS-4.2.1-Remote-Code-Execution.html
github.com/intelliants/subrion/commit/74359bcfaea424edda6d782a8ac25397c55972ab
github.com/intelliants/subrion/issues/801
nvd.nist.gov/vuln/detail/CVE-2018-19422