A vulnerability was found in Calendar Event Management System 2.3.0. It has been rated as critical. This issue affects some unknown processing of the component Login Page. The manipulation of the argument name/pwd leads to sql injection. The CWE definition for the vulnerability is CWE-89. The weakness was published 02/03/2023. It is possible to read the advisory at youtube.com. The identification of this vulnerability is CVE-2023-0663. The attack may be initiated remotely. Technical details are available. Furthermore, there is an exploit available. The exploit has been disclosed to the public and may be used. The pricing for an exploit might be around USD $0-$5k at the moment. The attack technique deployed by this issue is T1505 according to MITRE ATT&CK. It is declared as proof-of-concept. The exploit is available at youtube.com. We expect the 0-day to have been worth approximately $0-$5k. A possible mitigation has been published even before and not after the disclosure of the vulnerability.