WK Kellogg Co employee and vendor data stolen via Cleo file transfer platform
WK Kellogg Co disclosed a data breach where employee and vendor data was stolen via its third-party file transfer platform, Cleo. The Clop ransomware gang exploited two zero-day vulnerabilities (CVE-2024-50623 and CVE-2024-55956) in Cleo software on December 7, 2024. WK Kellogg learned of the incident on February 27, 2025, and officially notified authorities and affected individuals on April 4, 2025. At least one Maine resident's name and Social Security number were confirmed compromised.
Signal context
First seen: Apr 4, 2025
Last updated: Jun 26, 2026
Status: Public signal
Key points
- Employee and vendor data stolen.
- Impacted via third-party vendor Cleo's file transfer platform.
- Clop ransomware gang exploited zero-day vulnerabilities (CVE-2024-50623, CVE-2024-55956).
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: Information
Likely country: Location not provided
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
- Source type: supplier or third-party involvement
Impact area: Confidentiality, Availability
Likely asset: User or customer data
- 26 signals in the same sector
- 100 signals with the same likely impact area
- 1 signal linked to this organization/domain
External sources
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