Available for: OS X El Capitan v10.11 and v10.11.1
Impact: A malicious application may be able to masquerade as the Keychain Server.
Description: An issue existed in how Keychain Access interacted with Keychain Agent. This issue was resolved by removing legacy functionality.
So, it is a bug from Apple and might be will be resolved in next security or OS X update (10.11.3).
