Merak Mail Server 7.4.5 - 'calendar.html?schedule' SQL Injection

source: https://www.securityfocus.com/bid/10966/info
    
The webmail package embedded in Merak Mail Server is reported prone to multiple vulnerabilities.
    
The vulnerabilities reported are:
- Multiple cross-site scripting vulnerabilities
- An HTML injection vulnerability
- A PHP source code disclosure vulnerability
- An SQL injection vulnerability
    
These vulnerabilities are reported to exist in versions prior to 7.5.2.

/calendar.html?id=1'&schedule=[SQL]