A vulnerability was found in HadSky 7.7.16. It has been classified as problematic. This affects an unknown part of the file upload/index.php?c=app&a=superadmin:index. The manipulation leads to unrestricted upload. The CWE definition for the vulnerability is CWE-434. The weakness was released 03/28/2023. The advisory is shared at gitee.com. This vulnerability is uniquely identified as CVE-2023-1684. It is possible to initiate the attack remotely. Technical details are available. Furthermore, there is an exploit available. The exploit has been disclosed to the public and may be used. The price for an exploit might be around USD $0-$5k at the moment. MITRE ATT&CK project uses the attack technique T1608.002 for this issue. It is declared as proof-of-concept. The exploit is shared for download at gitee.com. We expect the 0-day to have been worth approximately $0-$5k. A possible mitigation has been published before and not just after the disclosure of the vulnerability.