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Data breaches in 2011

15 tracked incidents from 2011

Monday, March 23, 2026
BreachHave I Been PwnedMarch 23, 2026

RuneScape Boards

In around 2011, the now defunct RuneScape Boards forum (also known as RSBoards) suffered a data breach that was later redistributed as part of a larger corpus of data . The vBulletin-based service exposed 223k unique email addresses along with usernames, IP...

222,762 accounts affectedOccurred 2011
Thursday, November 27, 2025
BreachHave I Been PwnedNovember 27, 2025

China Software Developer Network

In 2011, the China Software Developer Network (CSDN) suffered a data breach that exposed over 6M user records . The data included email addresses alongside usernames and plain text passwords.

6,414,990 accounts affectedOccurred 2011
Thursday, July 11, 2019
BreachHave I Been PwnedJuly 11, 2019

Zhenai.com

In December 2011, the Chinese dating site known as Zhenai.com suffered a data breach that impacted 5 million subscribers. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has been...

5,024,908 accounts affectedOccurred 2011
Thursday, January 10, 2019
BreachHave I Been PwnedJanuary 10, 2019

Dangdang

In 2011, the Chinese e-commerce site Dangdang suffered a data breach . The incident exposed over 4.8 million unique email addresses which were subsequently traded online over the ensuing years.

4,848,734 accounts affectedOccurred 2011
Saturday, April 28, 2018
BreachHave I Been PwnedApril 28, 2018

17173

In late 2011, a series of data breaches in China affected up to 100 million users , including 7.5 million from the gaming site known as 17173. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese...

7,485,802 accounts affectedOccurred 2011
Tuesday, September 26, 2017
BreachHave I Been PwnedSeptember 26, 2017

7k7k

In approximately 2011, it's alleged that the Chinese gaming site known as 7k7k suffered a data breach that impacted 9.1 million subscribers. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese...

9,121,434 accounts affectedOccurred 2011
Wednesday, February 8, 2017
BreachHave I Been PwnedFebruary 8, 2017

Zoosk (2011)

In approximately 2011, an alleged breach of the dating website Zoosk began circulating. Comprised of almost 53 million records, the data contained email addresses and plain text passwords. However, during extensive verification in May 2016 no evidence could...

52,578,183 accounts affectedOccurred 2011
Sunday, January 8, 2017
BreachHave I Been PwnedJanuary 8, 2017

QIP

In mid-2011, the Russian instant messaging service known as QIP (Quiet Internet Pager) suffered a data breach . The attack resulted in the disclosure of over 26 million unique accounts including email addresses and passwords with the data eventually appearing...

26,183,992 accounts affectedOccurred 2011
Thursday, November 10, 2016
BreachHave I Been PwnedNovember 10, 2016

Dodonew.com

In late 2011, data was allegedly obtained from the Chinese website known as Dodonew.com and contained 8.7M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has been flagged...

8,718,404 accounts affectedOccurred 2011
Monday, November 7, 2016
BreachHave I Been PwnedNovember 7, 2016

Civil Online

In mid-2011, data was allegedly obtained from the Chinese engineering website known as Civil Online and contained 7.8M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has...

7,830,195 accounts affectedOccurred 2011
BreachHave I Been PwnedNovember 7, 2016

Duowan.com

In approximately 2011, data was allegedly obtained from the Chinese gaming website known as Duowan.com and contained 2.6M accounts. Whilst there is evidence that the data is legitimate, due to the difficulty of emphatically verifying the Chinese breach it has...

2,639,894 accounts affectedOccurred 2011
Thursday, June 30, 2016
BreachHave I Been PwnedJune 30, 2016

Tianya

In December 2011, China's largest online forum known as Tianya was hacked and tens of millions of accounts were obtained by the attacker. The leaked data included names, usernames and email addresses.

29,020,808 accounts affectedOccurred 2011
Saturday, May 28, 2016
BreachHave I Been PwnedMay 28, 2016

Fling

In 2011, the self-proclaimed "World's Best Adult Social Network" website known as Fling was hacked and more than 40 million accounts obtained by the attacker . The breached data included highly sensitive personal attributes such as sexual orientation and...

40,767,652 accounts affectedOccurred 2011
Sunday, December 20, 2015
BreachHave I Been PwnedDecember 20, 2015

Android Forums

In October 2011, the Android Forums website was hacked and 745k user accounts were subsequently leaked publicly. The compromised data included email addresses, user birth dates and passwords stored as a salted MD5 hash.

745,355 accounts affectedOccurred 2011
Sunday, May 11, 2014
BreachHave I Been PwnedMay 11, 2014

hackforums.net

In June 2011, the hacktivist group known as "LulzSec" leaked one final large data breach they titled "50 days of lulz" . The compromised data came from sources such as AT&T, Battlefield Heroes and the hackforums.net website . The leaked Hack Forums data...

191,540 accounts affectedOccurred 2011