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CVE-2026-54177 is an unrestricted file upload vulnerability in Laravel Backpack CRUD. The vulnerable upload handling improperly preserves or permits server-executable file extensions, allowing authenticated administrators to upload executable files into web-accessible storage. In affected deployments, the issue is associated with upload processing in components such as HasUploadFields and FileNameGenerator, where insufficient restriction of dangerous extensions can allow a malicious upload to be stored in a location that the web server can execute. If application-level validation is absent and uploaded content is exposed through public storage, the flaw can be leveraged to execute attacker-supplied code on the server.
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