This security advisory describes one critical risk vulnerability.
Exploit availability: Yes [Search exploit]Description
The vulnerability allows a remote attacker to execute arbitrary PHP code on the target system.
The weakness exists due to improper validation of input when performing an unserialize() call. A remote attacker can send a specially crafted URL request, inject and execute arbitrary PHP code on the system.
Successful exploitation of the vulnerability results in arbitrary PHP code execution on the vulnerable system.
Note: the vulnerability was being actively exploited.
Update to a patched version released after 2015-05-15.Vulnerable software versions
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.