HackingTechnologyHealthcareInformationVulnerability ExploitZero-DaySupply Chain (3P Vendor)Data ExfiltratedCustomer Data InvolvedBusiness Associate (HIPAA)Identity (basic)Government IDPHIHealth (basic)HighContained

MAXIMUS, Inc.

bd_eab9649547b60fb2 · schema v1 · pii pii-v1

Severity

High

Discovered

May 30, 2023

Filed

Jul 28, 2023

To disclose

8 weeks

Affected

4,852state residents only

Linked

17 filings

Confidence

66%

Full breach record for MAXIMUS, Inc. →7 incidents on file

Maximus, Inc. notified Idaho AG on July 28, 2023, of a data breach involving its MOVEit Transfer software. An unauthorized party exploited a zero-day vulnerability in the software between May 27 and May 31, 2023, to exfiltrate files containing personal information of at least 4,852 Idaho residents. Data included names, SSNs, ITINs, DOB, and medical/insurance info. Maximus took the system offline, applied patches, notified law enforcement (FBI), and offered 24 months of credit monitoring.

J jump to incidentP pin to compareR raw source

Incident timeline

undetected · 3 days

discovery → filing · 8 weeks / 59 days

May 27, 2023

Begins

May 30, 2023

Discovered

Jul 28, 2023

Filed

vs. sector median

10 wks faster

This filing is one of 17 about the same incident.View merged incident

Linked disclosures

Why this link?

Regulatory filings (10) · sorted by filing gap

California State AGbd_bf25ea19ea12a1242023-08-18 · +21dVerified
Indiana State AGbd_45d3fdf48f1c933d2023-08-24 · +27dVerified by operator
Vermont State AGbd_67d6131ab83daa012023-08-25 · +28dVerified by operator
Delaware State AGbd_97027e573fc51e132023-08-25 · +28dVerified by operator

Show 6 more filings ↓up to 166d gap

Washington State AGbd_d4deac1eb085d27a2023-08-25 · +28dVerified
New Hampshire State AGbd_fe9387821fda92642023-08-25 · +28dVerified by operator
Hawaii State AGbd_d3d3db6e2dd7a7a82023-08-26 · +29dVerified by operator
Oregon State AGbd_4a2584ab84dfe0f12023-08-29 · +32dVerified by operator
South Carolina State AGbd_a90da3e7c4e0509c2023-08-29 · +32dVerified
Idaho State AGbd_5312733f463970a32024-01-10 · +166dVerified by operator

Showing first 10 of 16 linked disclosures.

Name: MAXIMUS, Inc.
norm: maximus
Domain: maximus.com

Name: MAXIMUS, Inc.
norm: maximus
Domain: maximus.com
Industry: TechnologyllmHealthcarellm

Discovered: May 30, 2023
Breach occurred: May 27, 2023 – May 31, 2023
Undetected for: 3 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 28, 2023
Affected individuals: 4,852state-resident count only
Data types: Identity (basic)Government IDHealth (basic)PHI
Attack vector: Unauthorized Access
MITRE ATT&CK: T1190 Exploit Public-Facing ApplicationT1486 Data Encrypted for Impact
Threat actor: ExternalFinancial
Regulator citations: notified, and continues to cooperate with, the Federal Bureau of Investigation
Initial access: exploit_public_facing

During the incident: Took its MOVEit Transfer environment offline
Launched an investigation with the assistance of legal counsel and leading cybersecurity experts
Notified the impacted government agencies
Implemented vendor recommended security patches
Notified, and continues to cooperate with, the Federal Bureau of Investigation
Began notifying known affected Idaho residents via first class mail
Offered affected Idaho residents with 24 months of complementary IdentityWorksSM credit monitoring, identity restoration, and fraud detection services, through Experian
Notifying the major consumer reporting agencies regarding the incident
Changes made: Enhance its cybersecurity posture to safeguard against ever evolving cyber threats
Building on its written information security program
Apply vendor recommended actions as applicable
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 8 weeks(59 days from discovery to filing)
Compliance flags: — (clock not assessable for this source)

Status: No extraction artifact recorded for this disclosure.

Filing propagation · 11 filings · 10 states

View merged incident ↗

Idaho State AGJul 28 · first · this page

California State AG+21d

Indiana State AG+27d

Vermont State AG+28d

Delaware State AG+28d

Washington State AG+28d

New Hampshire State AG+28d

Hawaii State AG+29d

Oregon State AG+32d

South Carolina State AG+32d

Idaho State AG+166d

Pattern: first filing Jul 28 (ID), last Jan 10 (ID) — a 166-day rolling notification. Rolling spreads often mean counsel is filing as thresholds trip per state. Why this link?

Cascade drawn from the first 10 linked disclosures of 16 — the full spread may be wider.

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://www.ag.idaho.gov/content/uploads/2023/08/7-28-2023-Maximus-Inc.pdf
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 28, 2023
Raw hash: 5ca1ced4c19536bd5de76e6e48d02d7de81b63c02528bce3d93e40661d7197f1

Linked disclosures

Regulatory filings (10) · sorted by filing gap

Reporting entityMAXIMUS, Inc.

Victim entityMAXIMUS, Inc.

Incidentdiscovered May 30, 2023

Stated responseTook its MOVEit Transfer environment offline

Complianceclock not assessable

Extraction provenanceno artifact recorded

Source provenancewww.ag.idaho.gov