Email Address Breach Summary and Analysis

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Recent Global Data Breaches

  • CyrusOne - 373,460 breached accounts
    In August 2026, data centre operator CyrusOne was the target of a ShinyHunters "pay or leak" extortion attempt. The group subsequently published data allegedly obtained from the company, which included 373k unique email addresses across records relating to users, sales leads and CyrusOne employees. The data largely consisted of corporate contact information, including names, physical addresses, phone numbers and job titles. It also included support tickets and other information related to the organisation's operations.

     
  • Double Counter - 274,922 breached accounts
    In October 2026, the Discord server protection service Double Counter suffered a data breach attributed to a vulnerability in the Metabase analytics tool. In its disclosure notice, Double Counter advised that attackers gained access to a subset of its data. A corpus of data was subsequently published publicly and contained 275k unique email addresses and Discord usernames. A small number of records belonging to paying subscribers whose purchases were processed via Stripe were also present and included names, countries and postcodes.

     
  • Angel One - 6,765,054 breached accounts
    In July 2024, the Indian stock brokerage firm Angel One confirmed that data leaked online related to a breach that occurred in April 2023. The leaked data included 7.9M user records containing 6.8M unique email addresses, along with names, physical addresses, phone numbers, bank account numbers, Permanent Account Numbers (PANs) and portfolio holdings. Angel One emphasised that the breach "has no impact on client securities, funds, or credentials".

     
  • Medela - 423,947 breached accounts
    In September 2026, Swiss medical device company Medela was the target of a ShinyHunters "pay or leak" extortion campaign. The data allegedly obtained in the breach was later published publicly and included 424k unique email addresses belonging predominantly to healthcare professionals, Medela staff and leads. The exposed data consisted primarily of corporate contact information, including names, physical addresses and phone numbers, with some records also containing associated support tickets.

     
  • LimeLeads - 17,838,396 breached accounts
    In 2019, the now-defunct B2B marketing leads database service LimeLeads suffered a data breach due to an exposed, unsecured Elasticsearch server. The incident exposed tens of millions of records of largely corporate contact data containing 17.8M unique email addresses, along with phone numbers, employers, job titles and geographic locations including state, city and postcode.

     
  • Burger King Russia - 3,155,792 breached accounts
    In October 2024, news of a data breach exposing Burger King Russia customers broke following an August attack on the Mindbox marketing automation platform. The breach exposed 3.2M unique email addresses along with names, genders, dates of birth, phone numbers and approximate geolocations, with the data spanning 2018 to August 2024. Burger King Russia acknowledged the incident and advised it did not include payment or passport details.

     
  • Chess.com (2026) - 4,653,212 breached accounts
    In August 2026, millions of records allegedly sourced from Chess.com were posted online. The data contained 7.3M rows with 4.6M unique email addresses, along with usernames, names, countries and data relating to users' Chess.com accounts. Analysis of the data suggested it had been obtained by scraping. When loaded into HIBP, 99% of the email addresses had already appeared in previous data breaches, further supporting the scraping theory. Read more about scrapes and data breaches.

     
  • McKesson - 6,404,340 breached accounts
    In August 2026, healthcare and pharmaceutical company McKesson was targeted in a ShinyHunters "pay or leak" extortion campaign. The group subsequently published a substantial corpus of data they alleged was sourced from the company, which included 6.4M unique email addresses among other personal and corporate data attributes. The impacted data related to a range of individuals and roles, including marketing campaign recipients, patients, staff and healthcare provider contacts. In McKesson's disclosure notice, the company advised it had identified unauthorised access to "certain third-party applications and the exfiltration of certain data was associated with a subset of customers within our Oncology & Multispecialty and Medical-Surgical business units", but had "reasonable assurance of no ongoing unauthorized activity".

     
  • Manchester Airports Group - 8,849,657 breached accounts
    In August 2026, Manchester Airports Group (MAG) disclosed a data breach impacting their services. The incident was later claimed by the FulcrumSec hacking group, who subsequently published email addresses and phone numbers relating to 8.8M customers of Manchester, Stansted and East Midlands airports. The data contained personal information relating to airport services, including vehicle registrations and parking history, Fast Track purchases and lounge bookings. In their disclosure notice, MAG advised that "at no point has passenger safety or aviation security been compromised".

     
  • Questel - 1,226,209 breached accounts
    In August 2026, the French intellectual property software and services company Questel was the target of a ShinyHunters "pay or leak" extortion campaign. The group subsequently published an extensive corpus of data they alleged was obtained from the company, largely comprising corporate contact information associated with sales leads, support cases and marketing activities, with 1.2M unique email addresses. The data also included names, employers and job titles, along with physical addresses and phone numbers.

     
  • Carhartt - 12,933,413 breached accounts
    In August 2026, clothing retailer Carhartt was the target of a ShinyHunters "pay or leak" extortion campaign. The group subsequently published data allegedly obtained from the company including 12.9M unique email addresses, names, phone numbers and physical addresses. The published corpus also contained millions of synthetic records that did not relate to real individuals and were excluded from the breach.

     
  • NIUS - 6,090 breached accounts
    In July 2025, the German news service NIUS suffered a data breach which was subsequently leaked publicly. The data included 6k unique email addresses along with names, physical addresses and payment details for purchases including either IBANs or partial credit card data (masked card number, type and expiry).

     
  • Golf Canada - 568,972 breached accounts
    In mid-2026, hundreds of thousands of user records allegedly sourced from Golf Canada began circulating via Telegram. The data included 569k unique email addresses along with names, usernames, dates of birth, genders and approximate geographic locations (city, province and postcode). It remains unclear whether the data was obtained via unintentionally exposed website features or a security vulnerability.

     
  • Oz Hair and Beauty - 1,988,331 breached accounts
    In August 2026, Australian beauty retailer Oz Hair and Beauty was the target of an xpl0itrs extortion attack. The group subsequently published data allegedly obtained from the company, which included 2M unique email addresses along with names, phone numbers, geographic locations (suburb and postcode) and purchases.

     
  • Fanlore - 144,520 breached accounts
    In August 2026, the Organization for Transformative Works (OTW) identified unauthorised access to the Fanlore wiki it operates. The breach resulted in the exposure of 145k unique email addresses along with usernames and passwords stored as either MD5 or PBKDF2 hashes. OTW self-submitted the exposed data to HIBP.

     
  • RingCentral - 1,596,490 breached accounts
    In July 2026, the cloud-based business communications platform RingCentral was the target of a ShinyHunters "pay or leak" extortion campaign. The group subsequently published data they claimed was obtained from the platform, which included 1.6M unique email addresses along with names, physical addresses and phone numbers. In their disclosure notice, RingCentral advised that the incident affected "a limited portion of RingCentral customers" and that it was communicating directly with those affected.

     
  • Alcon - 218,395 breached accounts
    In August 2026, the Alcon eye care company was named in a ShinyHunters "pay or leak" extortion campaign. The group subsequently published data allegedly sourced from Alcon containing 218k unique email addresses along with other largely corporate B2B contact fields, including name, phone number and physical address.

     
    • breach data from: Have I Been pwned? (HIBP)

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