CVE-2016-1000031 is a vulnerabilty in the extremely widely used Apache Commons library commons-fileupload – you might not even know you’re having it on your class path. It has a very nasty Remote Code Execution vulnerability with easy to use exploits publicly available up to version 1.3.2. What makes it even worse is that you do not even need to use the library – you only need to have it on your class path and to deserialise some data. The data is the attack vector. You can find a good in detail explanation of the vulnerability here.
It did take a while but with version 1.3.3 this vulnerability is finally closed (by default).
There is some stuff that you should know about the fix though:
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