admin/blocks.php in Subrion CMS through 4.2.1 allows PHP Object Injection (with resultant file deletion) via serialized data in the subpages value within a block to blocks/edit.
belong2yourself.github.io/vulnerabilities/docs/Subrion%20CMS/Insecure%20Deserialization/Subpages%20-%20Authenticated%20PHP%20Object%20Injection/readme
github.com/belong2yourself/vulnerabilities/tree/master/Subrion%20CMS/Insecure%20Deserialization/Subpages%20-%20Authenticated%20PHP%20Object%20Injection
github.com/intelliants/subrion
nvd.nist.gov/vuln/detail/CVE-2020-12469