Companies are affected after the Okta breach.

Okta Inc (OKTA.O), whose authentication services are used to grant access to networks by firms such as FedEx Corp (FDX.N) and Moody’s Corp (MCO.N), and more than 15,000 clients, announced on Tuesday that it had been hacked and that some clients may have been affected. Okta reported that in the “worst-case” 366 of its clients …