HackingTechnologyInformationVulnerability ExploitData ExfiltratedCustomer Data InvolvedSupply Chain (3P Vendor)Government IDIdentity (basic)MediumContained

Fluke Corporation

bd_eaa101db5a9c19fb · schema v1 · pii pii-v1

Severity

Medium

Discovered

Sep 29, 2025

Filed

May 15, 2026

To disclose

33 weeks

Affected

Not disclosed

Linked

2 filings

Confidence

66%

Full breach record for Fluke Corporation →3 incidents on file

Fluke Corporation reported a data breach affecting California residents. A criminal actor exploited a vulnerability in a third-party business application, gaining unauthorized network access from August 10, 2025, to October 7, 2025. The incident exposed Social Security Numbers, dates of birth, and disability status indicators. Fluke engaged cybersecurity and forensics firms, ejected the actor, patched the vulnerability, and offered 24 months of credit monitoring.

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Leak gap clock✗ Leak >180d33 weeks discovery → filing

⚠ unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Incident timeline

undetected · 50 days

discovery → filing · 33 weeks / 228 days

Aug 10, 2025

Begins

Sep 29, 2025

Discovered

May 15, 2026

Filed

vs. sector median

+14 wks slower

This filing is one of 2 about the same incident.View merged incident

A leak claim by cl0p about this victim predates this filing by 182 days.View originating leak claim

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Maine State AGbd_6cf3241fdf1a32022026-05-14 · +1dCandidate

Name: Fluke Corporation
norm: fluke

Name: Fluke Corporation
norm: fluke
Domain: fluke.com
Industry: Technologyllm

Discovered: Sep 29, 2025
Breach occurred: Aug 10, 2025 – Oct 7, 2025
Undetected for: 50 daysoccurrence → discovery
Materiality determined: —
Notification sent: —
Affected individuals: Not disclosed
Data types: Government IDIdentity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Launched a thorough investigation with the support of a leading cybersecurity firm
Engaged a leading data forensics firm to analyze the contents of the data that may have been accessed without authorization
Ejecting the criminal actor from our network
Patching the vulnerability promptly after the third-party made a patch available
Resetting administrative passwords, removing malicious accounts, and ensuring no credentials were stolen or compromised
Deploying an endpoint detection and response tool with host-based detection and response capabilities on the host side, and a firewall management platform for network control and situational awareness
Changes made: Patching the vulnerability promptly after the third-party made a patch available
Resetting administrative passwords, removing malicious accounts, and ensuring no credentials were stolen or compromised
Deploying an endpoint detection and response tool with host-based detection and response capabilities on the host side, and a firewall management platform for network control and situational awareness
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 33 weeks(228 days from discovery to filing)
Compliance flags: Leak >180d
Discovery-date grounding: unattributedNo provenance was recorded for this discovery date and it matches no other date on the record. It may be correct, but it is not independently grounded.

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Maine State AGMay 14 · first

California State AG+1d · 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://oag.ca.gov/ecrime/databreach/reports/sb24-623465
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: May 15, 2026
Raw hash: 72232d38b4422c8ac2e06f084e4eb23c79780eb5bad6d4c02fc3f75079a8c677

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityFluke Corporation

Victim entityFluke Corporation

Incidentdiscovered Sep 29, 2025

Stated responseLaunched a thorough investigation with the support of a leading cybersecurity firm

ComplianceLeak >180d

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov