HPE Notifies Employees of Data Breach Following Russian Office 365 Hack
Hewlett Packard Enterprise (HPE) began notifying employees on January 29, 2025, about a data breach. Russian state-sponsored hackers (Midnight Blizzard, also known as Cozy Bear) gained unauthorized access to HPE's cloud-based Office 365 email environment in May 2023. The attackers exfiltrated data, including driver's licenses, credit card numbers, and Social Security numbers, from a small percentage of employee mailboxes, particularly those in cybersecurity, go-to-market, and business segments.
Hpe
Signal context
First seen: Jan 29, 2025
Last updated: Jul 1, 2026
Status: Public signal
Key points
- HPE began notifying affected employees on January 29, 2025.
- Russian state-sponsored hackers (Midnight Blizzard/Cozy Bear) were responsible.
- Unauthorized access to HPE's Office 365 email environment occurred in May 2023.
Signal analysis
BetaThis analysis groups the signal by industry, likely incident action and impacted security area. It helps compare this signal with other published signals without treating the labels as final determinations.
Sector: Professional, Scientific, and Technical Services
Likely country: 🇳🇱 Netherlands
inferred from source domains
The feed marks multiple actor roles. Treat this as a review signal rather than a final attribution.
- Source type: outside the affected organization
- Source type: possible insider or internal misuse
Impact area: Confidentiality
Likely asset: User or customer data, Server or cloud data store
- 4 signals in the same sector
- 88 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
Cyberoorlog nieuws 2025 februari - Cybercrimeinfohttps://www.ccinfo.nl/menu-onderwijs-ontwikkeling/cybercrime/cyberoorlog/2367572_cyberoorlog-nieuws-2025-februariPublic source from ccinfo.nl.
HPE notifies employees of data breach after Russian Office 365 hack - Bleeping Computerhttps://www.bleepingcomputer.com/news/security/hpe-notifies-employees-of-data-breach-after-russian-office-365-hack/Public source from bleepingcomputer.com.
HPE is notifying individuals affected by a December 2023 attack - Security Affairshttps://securityaffairs.com/174057/data-breach/hpe-notifying-individuals-impacted-by-december-2023-attack.htmlPublic source from securityaffairs.com.
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