Breach Archive

Showing 631645 of 1,265 breaches

Mangatoon

Compromised Data: 23

2022-05 marked when Mangatoon acknowledged an intrusion that reached nearly 23 million records. In May 2022, the Hong Kong based Manga service Mangatoon suffered a security incident that revealed 23M subscriber records.…

  • Breach date: 2022-05-01
  • Auth tokens
  • Avatars
  • Email addresses
  • Genders
  • Names
  • Passwords
  • Social media profiles
  • Usernames

Manipulated Caiman

Compromised Data: 39

Security reports tie the Manipulated Caiman incident to 2023-07, impacting close to 39.9 million records overall. In July 2023, Perception Point reported on a phishing operation dubbed "Manipulated Caiman". Targeting pr…

  • Breach date: 2023-07-01
  • Email addresses

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

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

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

Mavis Tire Supply

Compromised Data: 23.4 million

NULL

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

McDonalds (Partial)

Compromised Data: 12.2 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
  • Home Address

Mecho Download

Compromised Data: 437

Mecho Download traced the breach to 2013-10, estimating that about 437.9 thousand records were affected. In October 2013, the (now defunct) downloads website "Mecho Download" suffered a security incident that revealed 4…

  • Breach date: 2013-10-01
  • Email addresses
  • IP addresses
  • Passwords
  • Usernames

MediaWorks

Compromised Data: 162

2023-03 marked when MediaWorks acknowledged an intrusion that reached nearly 162.7 thousand records. In March 2024, millions of rows of data from the New Zealand media company MediaWorks was publicly posted to a popular…

  • Breach date: 2023-03-01
  • Dates of birth
  • Email addresses
  • Genders
  • Phone numbers
  • Physical addresses
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