Almost four million users of a popular Android dating app have had their personal and log-in data stolen by hackers, according to Risk Based Security. The security vendor said it found the data on a prominent hacking forum — now free for anyone to access, although it had been previously up for sale. It’s associated with nearly 3.7 million users of MobiFriends, a Barcelona-based dating app. The information was originally posted to the forum in January of this year by a threat actor named “DonJuji,” but is attributed to a breach in January 2019. The data includes dates of birth, gender, website activity, mobile numbers, usernames, email addresses and MD5 hashed passwords.