HackingGovernmentGovernmentCustomer Data InvolvedIdentity (basic)Government IDHealth (basic)MediumContained

The DuPage County Sheriff's Office

bd_23b7333e013e0da4 · schema v1 · pii pii-v2

Severity

Medium

Discovered

Apr 28, 2025

Filed

Nov 4, 2025

To disclose

—

Affected

Not disclosed

Linked

2 filings

Confidence

64%

Full breach record for The DuPage County Sheriff's Office →

The DuPage County Sheriff's Office experienced a data security incident on April 28, 2025, resulting in unauthorized access to files containing personal information. Affected data included names, driver's license numbers, biometric identifiers, and medical information. The Sheriff's Office engaged independent cybersecurity experts, confirmed the breach on October 20, 2025, and sent notification letters on October 31, 2025. No evidence of misuse was found. Affected individuals were offered 12 months of credit monitoring and identity protection services.

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Incident timeline

Apr 28, 2025

Begins

Apr 28, 2025

Discovered

Nov 4, 2025

Filed

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

Linked disclosures

Why this link?

Regulatory filings (1) · sorted by filing gap

Indiana State AGbd_9776a587c28317f32025-11-04Candidate

Name: The DuPage County Sheriff's Office
norm: the dupage county sheriff s office

Name: The DuPage County Sheriff's Office
norm: the dupage county sheriff s office
Industry: Governmentllm

Discovered: Apr 28, 2025
Breach occurred: Apr 28, 2025
Undetected for: 0 daysoccurrence → discovery
Materiality determined: —
Notification sent: Oct 31, 2025
Affected individuals: Not disclosed
Data types: Identity (basic)Government IDHealth (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing Application
Threat actor: External
Initial access: exploit_public_facing

During the incident: Engaged independent cybersecurity experts
Launched a comprehensive review of all potentially affected information
Offered complimentary identity protection services through Cyberscout
Changes made: Implemented measures to enhance security
Source: Quoted from the filing itself, not independently verified.

Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 2 filings · 2 states

View merged incident ↗

Indiana State AGNov 4 · first

Nebraska State AGNov 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://nebraska.gov/ago/data-breach/documents/28053ea9-f784-40f1-885a-492f2bf9a183.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Nov 4, 2025
Raw hash: 7ffe0d802e72b908ab56e48b705b9c5e03de5733dcb4982437337bb325284cfc

Linked disclosures

Regulatory filings (1) · sorted by filing gap

Reporting entityThe DuPage County Sheriff's Office

Victim entityThe DuPage County Sheriff's Office

Incidentdiscovered Apr 28, 2025

Stated responseEngaged independent cybersecurity experts

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancenebraska.gov