webchess v1.0 was discovered to contain a SQL injection vulnerability via the $playerID parameter at mainmenu.php. NOTE: this is disputed by a third party who indicates that the playerID is a session variable controlled by the server, and thus cannot be used for exploitation.
https://sourceforge.net/projects/webchess
https://github.com/KLSEHB/vulnerability-report/blob/main/webchess_CVE-2023-39851