On Friday, Oracle released a critical patch for it's Identity Manager, which is part of Fusion Middleware. The vulnerability patched with this update does affect all current versions of the product, and has a CVSS score of 10. The patch comes just about two weeks after Oracle's regular Critical Patch Update (CPU).
According to Oracle's summary, the patch secures a default account that can be used to log in via HTTP to take over the system. Once these default credentials become known, exploitation should be trivial.
For details, see Oracle's announcement here:
Oct 30th 2017
2 months ago