An improper limitation of a pathname to a restricted directory ('Path Traversal') vulnerability in Backup.Repository webapi component in Synology Hyper Backup before 4.1.2-4036 allows remote authenticated users with administrator privileges to write specific files containing non-sensitive information via unspecified vectors.
https://www.synology.com/en-global/releaseNote/HyperBackup?model=DS224%2B&os=DSM&version=7_x_series