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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCooler Master says it detected unauthorized activity on May 19, 2024. The company’s public notice described a limited potential impact, while a threat actor was reported to have claimed that 103 GB of data involving nearly half a million customers was stolen. Cooler Master’s notice does not confirm that larger figure.
What happened?
In a Massachusetts breach notice, Cooler Master said it detected unauthorized activity in its systems on May 19, 2024. It said it worked with an outside forensic team to investigate and contain the activity. In its public announcement, the company said the investigation was ongoing, that it believed little consumer data and no partner business data had been improperly accessed, and that it had identified and eliminated the incident and added safeguards. Those statements were a preliminary assessment, not a published final finding. Massachusetts notice · Cooler Master announcement
Is the half-million figure confirmed?
No. A June 2024 recap attributed the claim that 103 GB of data, including information on nearly half a million customers, was stolen to the threat actor. The company announcement reviewed here does not confirm either number, and no independently verified final count is established in the available accounts. Treat both figures as allegations, not a confirmed tally. DuoCircle’s June 2024 recap
| Account | Reported scope | Status |
|---|---|---|
| Cooler Master | A very limited number of loyalty members; names, phone numbers, postal addresses and credit card information were described as potentially involved. | Preliminary company assessment; the announcement said the investigation was ongoing. Cooler Master |
| Threat actor claim, as recapped by DuoCircle | 103 GB of allegedly stolen data involving nearly half a million customers; reported categories included names, emails, residential addresses, birth dates and phone numbers, as well as partial card data. | Allegation attributed to the threat actor; not a company-confirmed count or verified inventory. DuoCircle |
What information may have been involved?
Cooler Master’s Massachusetts notice says information acquired may have included names, postal addresses, phone numbers, email addresses and credit card information. It says the company’s initial investigation showed that the credit card numbers related to expired cards. The company’s announcement separately described names, phone numbers, postal addresses and credit card information for a very limited number of loyalty members. Neither description means every listed data type applied to every person. Massachusetts notice · Cooler Master announcement
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The broader set of categories in the threat actor’s alleged haul—including birth dates and partial card data—comes from secondary reporting, not a confirmed company inventory. The accounts reviewed do not establish whether the alleged data was later released or used, or whether Cooler Master published a final investigation outcome. Do not assume you were affected unless Cooler Master notified you.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should customers do?
Cooler Master’s announcement advised people to watch their accounts and take practical precautions. HotHardware also warned Fanzone members to be alert for phishing attempts and unexpected card charges. Cooler Master announcement · HotHardware archive
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- Watch bank, card and other account activity for unfamiliar transactions or changes. The company said the card numbers identified in its initial investigation related to expired cards, but that does not establish that every person’s information was unaffected.
- Be cautious with unexpected messages that ask for passwords, payment details or other personal information. Verify requests through a trusted channel rather than following links in suspicious emails or texts.
- Change passwords for relevant accounts, particularly if you reused a password. Use a unique password for each account.
- Request your annual credit reports and monitor your credit score and account activity, as Cooler Master advised.
- If considering an information-protection service, first check whether your insurer or card issuer already provides coverage at no cost. Cooler Master also suggested considering a credit lock.
- If you received a notice from Cooler Master, follow its specific instructions. The company said it would contact impacted people with information and steps, and directed customers with questions to the address in its announcement.
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