Bitcoinist.net:

Poloniex suffers BitMEX style security breach

As this decade inches to a close, Poloniex becomes the next cryptocurrency exchange to mismanage user data after “someone leaked” email addresses and passwords.

Poloniex Forces Users to Reset Passwords
After rampant scams and phishing attempts, Poloniex customers were rightly cautious over the email they received from the cryptocurrency exchange on Dec 30.
One customer tagged Poloniex on Twitter telling the company to “be careful” with the “scam” email doing the rounds.

@Poloniex be careful with this Scam email we are getting in our emails #BTC #LTC #ETH #DASH #Crypto #Poloniex pic.twitter.com/untSVGfwAM
— Charly (@charlysatoshi) December 30, 2019

To be fair, with so many phish in the sea, Poloniex’s email was certainly vague. There were no details or facts about the cause or consequence–or size–of the breach.
It merely said…

Click to continue reading on its source location…

Source: https://bitcoinist.com/poloniex-exchange-security-breach/