Horde '_formvars' Form Input Remote Code Execution Vulnerability

Summary
Horde is prone to a remote code-execution vulnerability.
Impact
Attackers can exploit this issue to execute arbitrary code within the context of the affected application. Failed exploit attempts may result in denial-of-service conditions.
Solution
Updates are available.
Insight
Horde could allow a remote attacker to execute arbitrary code on the system, caused by the improper validation of _formvars form input.
Affected
Horde 3.1.x through versions 5.1.1 are vulnerable other versions may also be affected.
Detection
Try to execute the phpinfo() command by sending a special crafted HTTP POST request.
References