Magento Long Term Support (LTS) versions prior to 20.17.0 contain a vulnerability where PHP functions like getimagesize(), file_exists(), and is_readable() can trigger deserialization when processing phar:// stream wrapper paths. The vulnerability occurs during image validation and media handling processes. Attackers can exploit this by uploading malicious phar files disguised as images and triggering these functions with phar:// paths to achieve arbitrary code execution. This affects the community-driven alternative to Magento Community Edition e-commerce platform. Version 20.17.0 patches this issue.