Breach Archive

Showing 961975 of 1,843 breaches

Mappery

Compromised Data: 19.6 thousand

In December 2018, Mappery, an online platform dedicated to map sharing and cartography enthusiasts, suffered a data breach that compromised over 205,000 user accounts. The exposed information included email addresses an…

  • Breach date: 2018-12-11
  • Email

Mappery

Compromised Data: 205

2018-12 marked when Mappery acknowledged an intrusion that reached nearly 205.2 thousand records. In December 2018, the mapping website Mappery suffered a security incident that revealed over 205k unique email addresses…

  • Breach date: 2018-12-01
  • Email addresses
  • Geographic locations
  • Passwords
  • Usernames

Market Moveis

Compromised Data: 28

Around 2023-08, investigators concluded that Market Moveis had exposed roughly 28.2 thousand records. In August 2023, the Portuguese home decor company Market Moveis suffered a security incident that impacted 28k record…

  • Breach date: 2023-08-01
  • Email addresses
  • Names

Marriott (Partial)

Compromised Data: 1.1 million

The incident is one of several breaches affecting Salesforce in 2025. A group calling itself "Scattered LAPSUS$ Hunters" released a limited sample of the stolen database on October 3, 2025. The records have since been i…

  • Breach date: 2025-10-10
  • Email
  • Phone Number

Mashable

Compromised Data: 1

For Mashable, the timeline centers on 2020-06 with approximately 1.4 million records discovered in the cache. In approximately mid-2020, Mashable suffered a security incident that subsequently turned up publicly in Nove…

  • Breach date: 2020-06-01
  • Auth tokens
  • Email addresses
  • Genders
  • Geographic locations
  • IP addresses
  • Names
  • Partial dates of birth
  • Social media profiles

Mass General Brigham

Compromised Data: 4.1 million

The Mass General Brigham Health Plan data breach, linked to the exploitation of a vulnerability in Progress Software’s MOVEit Transfer platform by the Cl0p ransomware group, exposed extensive patient information managed…

  • Breach date: 2023-05-31
  • Email
  • Phone Number
  • Name
  • Home Address
  • Medical Records
  • Insurance Provider

Master Deeds

Compromised Data: 2

2017-03 marked when Master Deeds acknowledged an intrusion that reached nearly 2.3 million records. In March 2017, a 27GB database backup file named "Master Deeds" was sent to HIBP by a supporter of the project. Upon de…

  • Breach date: 2017-03-01
  • Dates of birth
  • Deceased statuses
  • Email addresses
  • Employers
  • Ethnicities
  • Genders
  • Government issued IDs
  • Home ownership statuses
  • Job titles
  • Names
  • Nationalities
  • Phone numbers
  • Physical addresses

Mastercard Priceless Specials

Compromised Data: 89

Security reports tie the Mastercard Priceless Specials incident to 2019-08, impacting close to 89.4 thousand records overall. In August 2019, the German Mastercard bonus program "Priceless Specials" suffered a security…

  • Breach date: 2019-08-01
  • Email addresses
  • IP addresses
  • Names
  • Partial credit card data
  • Phone numbers
  • Salutations

Mate1.com

Compromised Data: 27.4 million

In February 2016, the dating site mate1.com experienced a significant data breach that exposed subscribers' personal information, including details about their private lives and plain text passwords.

  • Breach date: 2016-02-29
  • Username
  • Password
  • Email
  • Name

Mate1.com

Compromised Data: 27

2016-02 marked when Mate1.com acknowledged an intrusion that reached nearly 27.4 million records. In February 2016, the dating site mate1.com suffered a huge security incident resulting in the disclosure of over 27 mill…

  • Breach date: 2016-02-01
  • Astrological signs
  • Dates of birth
  • Drinking habits
  • Drug habits
  • Education levels
  • Email addresses
  • Ethnicities
  • Fitness levels
  • Genders
  • Geographic locations
  • Income levels
  • Job titles
  • Names
  • Parenting plans
  • Passwords
  • Personal descriptions
  • Physical attributes
  • Political views
  • Relationship statuses
  • Religions
  • Sexual fetishes
  • Travel habits
  • Usernames
  • Website activity
  • Work habits

Mate1.com

Compromised Data: 27.4 million

2016-02-01 marked the discovery that Mate1.com had leaked close to 27,403,959 records during a breach. In February 2016, mate1.com, a dating website, experienced a major security incident. The incident revealed the pers…

  • Breach date: 2016-02-01
  • username
  • name_first
  • name_last
  • birthdate_full
  • email
  • password

Mathway

Compromised Data: 25.7 million

In January 2020, Mathway experienced a data breach that exposed user records, which were later sold on a dark web marketplace.

  • Breach date: 2020-01-13
  • Email
  • Facebook ID
  • Name

Mathway

Compromised Data: 25

For Mathway, the timeline centers on 2020-01 with approximately 25.7 million records discovered in the cache. In January 2020, the math solving website Mathway suffered a security incident that revealed over 25M records…

  • Breach date: 2020-01-01
  • Device information
  • Email addresses
  • Names
  • Passwords
  • Social media profiles

Mathway

Compromised Data: 25.9 million

Around 2020-01-01, investigators linked a data spill at Mathway to nearly 25,866,113 compromised records. In January 2020, Mathway experienced a security incident that resulted in the spill of over 25 million records. C…

  • Breach date: 2020-01-01
  • email
  • hashed_password
  • name_first
  • name_last
  • social

Mavis Tire Supply

Compromised Data: 23.4 million

NULL

  • Breach date: 2025-09-23
  • Social Security Number
  • Email
  • Phone Number
  • Name
  • Home Address
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