An unauthenticated SQL injection vulnerability exists in Kimai version 0.9.2.x via the db_restore.php endpoint. The flaw allows attackers to inject arbitrary SQL queries into the dates[] POST parameter, enabling file write via INTO OUTFILE under specific environmental conditions. This can lead to remote code execution by writing a PHP payload to the web-accessible temporary directory. The vulnerability has been confirmed in versions including 0.9.2.beta, 0.9.2.1294.beta, and 0.9.2.1306-3.