In February 2014, the Forbes website succumbed to an attack that leaked over 1 million user accounts. The attack was attributed to the Syrian Electronic Army, allegedly as retribution for a perceived "Hate of Syria". The attack not only leaked user credentials, but also resulted in the posting of fake news stories to forbes.com.
Record: 1.1 million
In May 2016, the multiplayer server for Minecraft service Shotbow announced they'd suffered a data breach. The incident resulted in the exposure of over 1 million unique email addresses, usernames and salted SHA-256 password hashes.
In August 2015, the storytelling service StoryBird suffered a data breach exposing 4 million records with 1 million unique email addresses. Impacted data also included names, usernames and passwords stored as PBKDF2 hashes. The data was provided to HIBP by dehashed.com.
Record: 1.0 million
In early 2017, the forum for the gaming website R2 Games was hacked. R2 had previously appeared on HIBP in 2015 after a prior incident. This one exposed over 1 million unique user accounts and corresponding MD5 password hashes with no salt.
In mid-2012, the real-time strategy game War Inc. suffered a data breach. The attack resulted in the exposure of over 1 million accounts including usernames, email addresses and salted MD5 hashes of passwords.
In March 2015, the anime and manga forum HongFire suffered a data breach. The hack of their vBulletin forum led to the exposure of 1 million accounts along with email and IP addresses, usernames, dates of birth and salted MD5 passwords.
Record: 999991
In approximately January 2017, the Lady Gaga fan site known as "Little Monsters" suffered a data breach that impacted 1 million accounts. The data contained usernames, email addresses, dates of birth and bcrypt hashes of passwords.
Record: 995698
In approximately March 2017, the file sharing website Bolt suffered a data breach resulting in the exposure of 995k unique user records. The data was sourced from their vBulletin forum and contained email and IP addresses, usernames and salted MD5 password hashes. The site was previously reported as compromised on the Vigilante.pw breached database directory.
Record: 995274
In December 2017, the pet care delivery service PetFlow suffered a data breach which consequently appeared for sale on a dark web marketplace. Almost 1M accounts were impacted and exposed email addresses and passwords stored as unsalted MD5 hashes. The data was provided to HIBP by a source who requested it be attributed to "nano@databases.pw".
Record: 990919
In approximately June 2016, the real estate website StreetEasy suffered a data breach. In total, 988k unique email addresses were included in the breach alongside names, usernames and SHA-1 hashes of passwords, all of which appeared for sale on a dark web marketplace in February 2019. The data was provided to HIBP by a source who requested it be attributed to "JimScott.Sec@protonmail.com".
Record: 988230