This release fixes a few reported security issues.
This version is fully compatible with all previous 1.8 versions, but it is still highly recommend to update to 1.8.7 as soon as possible.
Notable fixes in 1.8.7:
Resource packs do not get cleaned up.
Resource packs continue downloading after disconnect.
Specific unicode character pair crashes tr_TR clients.
Signs can cause crashes.
Please make sure that you are in the correct server mode (online mode/offline mode) when you start the 1.8.7 server for the first time, because profiles are not compatible between these two server modes.