File Upload

Defense-in-depth module that blocks the PolyShell unrestricted file upload attack with layered checks: request/media path blocking, strict filename/extension validation, and polyglot content detection. Provides Composer install steps, admin-configurable allow/block lists, logging, and migration from markshust/polyshell-patch.

Since Searchlight Cyber published a technical write up and proof-of-concept for the SessionReaper vulnerability, attackers have been mass scanning Magento / Adobe Commerce stores for vulnerable targets. The first phase of the attack involves uploading a payload containing malicious session data to the server.