The vulnerability stemmed from improper path sanitization in BinaryDataManager. The pre-patch versions used path.join() with user-controlled input (identifier parameter) without validation(). The commit introduced resolveStoragePath() to check for path traversal attempts. The getBinaryPath and getMetadataPath functions were directly vulnerable as they handled user-supplied identifiers and constructed file paths without preventing directory traversal sequences. The high confidence comes from the explicit path traversal checks added in the patch and CWE-22 mapping in the advisory.