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Wkkellogg cybersecurity incidents and threat signals
wkkellogg.com
This company page brings together public reporting currently associated with Wkkellogg. It reflects signals published by Shadow Tier and should not be read as a complete incident history.
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June 26, 2026
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Based on all published signals currently linked to Wkkellogg. Affected countries come from victim data; the company country above remains a separate profile fact. Counts describe this reporting set, not overall incident prevalence.
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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.
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What does the Wkkellogg page include?
It combines a reviewed organization profile with all current published Shadow Tier signals explicitly linked to Wkkellogg.
Does every mention of Wkkellogg appear here?
No. A signal must contain a reliable company connection and meet the publication criteria; incidental or ambiguous mentions are excluded.
Why can the incident count change?
The page follows current published reporting. Counts change as new evidence is added, classifications are reviewed, or older signals leave the reporting window.