HackingRetail & ConsumerRetailSupply Chain (3P Vendor)Customer Data InvolvedPIIIdentity (basic)LowContained

WK KELLOGG CO

bd_8aaba010cf1da3a8 · schema v1 · pii pii-v1

Severity

Low

Discovered

Feb 27, 2025

Filed

Apr 4, 2025

To disclose

5 weeks

Affected

Not disclosed

Linked

5 records

Confidence

65%

Full breach record for WK KELLOGG CO →2 incidents on file

WK Kellogg Co. notified individuals of a security incident involving its third-party file transfer vendor, Cleo. An unauthorized person gained access to Cleo-hosted servers on December 7, 2024, which were used to transfer employee files. WK Kellogg learned of the incident on February 27, 2025. The affected data included employee personal information. The company engaged Cleo in the investigation and is offering complimentary identity monitoring services via Kroll.

J jump to incidentP pin to compareR raw source

Leak gap clock⏱ Leak >30d5 weeks discovery → filing

Incident timeline

undetected · 82 days

discovery → filing · 5 weeks / 36 days

Dec 7, 2024

Begins

Feb 27, 2025

Discovered

Apr 4, 2025

Filed

vs. sector median

4 wks faster

This filing is one of 5 records about the same incident.View merged incident

Part of Cleo supply-chain incident (2025) — a supply-chain cascade affecting multiple organizations.View cascade →

A leak claim by cl0p about this victim was first seen 36 days before this filing.View originating leak claim

Linked disclosures

Why this link?

Ransomware claims (1)

Leak Sitecl0pbd_6d36243d4b4a9ca62025-02-27 · +36dVerified

Regulatory filings (3) · sorted by filing gap

Maine State AGbd_33282fd020487c032025-04-04Verified
Indiana State AGbd_5274f974c8dcc3832025-04-04Verified
Massachusetts State AGbd_faf7ac7456a8c7132025-04-04Verified by operator

Name: WK KELLOGG CO
norm: wk kellogg
Domain: wkkellogg.com

Name: WK KELLOGG CO
norm: wk kellogg
Domain: wkkellogg.com
Industry: Retail & Consumerllm

Discovered: Feb 27, 2025
Breach occurred: Dec 7, 2024
Undetected for: 82 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: PIIIdentity (basic)
Attack vector: Third-Party / Supply Chain
MITRE ATT&CK: T1195 Supply Chain CompromiseT1078 Valid Accounts
Threat actor: External
Initial access: trusted_relationship

During the incident: Began to investigate
Contacted Cleo
Worked with Cleo to identify the measures it has taken to address this incident
Offering you the option (at no cost to you) to activate in <<Monitoring Term Length (Months)>> months of identity monitoring services provided by Kroll
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 5 weeks(36 days from discovery to filing)
Compliance flags: Leak >30d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 4 filings · 4 states

View merged incident ↗

Maine State AGApr 4 · first

Indiana State AGApr 4 · first

Massachusetts State AGApr 4 · first

New Hampshire State AGApr 4 · first · this page

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://mm.nh.gov/files/uploads/doj/remote-docs/wk-kellogg-20250404.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Apr 4, 2025
Raw hash: d8e0c4b7b69f102e8f8732a5328d609a53e470dc19c5fdb4fd0a575a5567afc2

Linked disclosures

Ransomware claims (1)

Regulatory filings (3) · sorted by filing gap

Reporting entityWK KELLOGG CO

Victim entityWK KELLOGG CO

Incidentdiscovered Feb 27, 2025

Stated responseBegan to investigate

ComplianceLeak >30d

Extraction provenanceno artifact recorded

Source provenancemm.nh.gov