Grav before 2.0.16 contains a path traversal vulnerability in MediaUploadTrait::deleteFile() that allows authenticated users with media management permissions to delete arbitrary files by supplying filenames with directory traversal sequences. The method validates only the basename portion of the filename while preserving unvalidated directory paths containing ../ sequences that are passed to unlink(), enabling deletion of files outside the intended media storage directory.

Grav CMS versions before 2.0.16 contain a path traversal vulnerability in the MediaUploadTrait::deleteFile() method. Authenticated users with media management permissions can exploit this flaw to delete arbitrary files on the server by supplying filenames containing directory traversal sequences (../). The vulnerability exists because the method only validates the basename portion of the filename, while leaving the directory path portion unvalidated. These unvalidated paths containing ../ sequences are then passed directly to PHP's unlink() function, allowing deletion of files outside the intended media storage directory. The flaw is fixed in Grav version 2.0.16. This is a significant security risk as it can lead to deletion of critical system or application files, potentially causing denial of service or aiding further compromise.