Yahoo embarrassment: Federal agents had to tell the company it had been hacked. Again.

Yahoo says a foreign nation may have played a role in its gargantuan and humiliating data breach but some experts suggest Yahoo’s staff and leadership were simply negligent at detecting intrusions.

These experts say the breach, affecting an estimated one billion accounts, was not technically sophisticated and possibly the work of a cybercrime gang operating in Eastern Europe.

“Eighty percent of the time, the use of ‘advanced’ and ‘sophisticated’ and ‘nation state’ is overstated,” said Paul Calatayud, chief technology officer at FireMon, a Kansas City, Mo., company that offers cyber intelligence and compliance services. “It just kind of glorifies the situation more rather than the onus being on, ‘What happened?’ It’s more defensible.”