Serendipity 'functions_trackbacks.inc.php' SQL Injection Vulnerability

Summary
Serendipity is prone to an SQL-injection vulnerability because it fails to sufficiently sanitize user-supplied data before using it in an SQL query. A successful exploit may allow an attacker to compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database. Serendipity 1.6.1 is vulnerable other versions may also be affected.
Solution
Updates are available please see the references for details.
References