CVE-2023-39851: Webchess Project Webchess

Critical severity, CVSS 9.8. EPSS: 0.8% chance of exploitation in the next 30 days.

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.

Affected products

• Webchess Project Webchess: version 1.0 only

Published 2023-08-15. Last modified 2026-06-17.