BreachCensus

Maximus, Inc.

Professional ServicesUnited States of America

Maximus, Inc. is a professional services organisation in Massachusetts. It appears on the Massachusetts Attorney General breach-notification register, the California Attorney General breach-notification register, the Washington State Attorney General breach-notification register, the Hawaii Office of Consumer Protection breach-notice list and the Delaware Attorney General data security breach database with 6 confirmed incidents (7 filings); the most recent notice was filed on August 26, 2023.

Headquarters
Tysons, United States
LEI
549300DQCDS8HJ7QF202
Wikidata
Q6795931

Data as of October 17, 2026.

Confirmed incident

Filed in HI, WA and DE — Unauthorized Access/Disclosure

The same incident was filed separately with 3 jurisdictions within a few days of each other (HI, WA and DE) — shown here as one incident.

Occurred
May 27, 2023
Disclosed
August 26, 2023

Timeline

  1. August 25, 2023
    Reported to regulator Regulator

    WA AG breach notification: 70,847 Washington residents affected

    source
  2. August 25, 2023
    Reported to regulator Regulator

    DE AG breach notification: 14,158 Delaware residents affected

    source
  3. August 25, 2023
    Reported to regulator Regulator

    DE AG breach notification: 14,158 Delaware residents affected

    source
  4. August 25, 2023
    Reported to regulator Regulator

    DE AG breach notification: 14,158 Delaware residents affected

    source
  5. August 26, 2023
    Reported to regulator Regulator

    HI AG breach notification: 2,807 Hawaii residents affected

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
What a Hawaii notice means

Governed by HRS §487N-2. Notice to the Office of Consumer Protection is required when a breach affects 1,000 or more Hawaii residents.

Note: the count is Hawaii residents only, not a total.

Hawaii breach-notification register ↗

What a Washington notice means

Governed by RCW 19.255.010. Notice to the Attorney General is required when a breach affects more than 500 Washington residents.

Note: the count is Washington residents only, not a total.

Washington breach-notification register ↗

What a Delaware notice means

Governed by 6 Del. C. §12B-102. Notice to the Attorney General is required when a breach affects more than 500 Delaware residents.

Note: the count is Delaware residents only, not a total.

Delaware breach-notification register ↗

Confirmed incident

US-MA

Disclosed
July 28, 2023

Timeline

  1. July 28, 2023
    Reported to regulator Regulator

    MA AG breach notification: 58,800 Massachusetts residents affected

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
What a Massachusetts notice means

Governed by M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.

Note: the count is Massachusetts residents only, not a total.

Massachusetts breach-notification register ↗

Confirmed incident

US-MA

Disclosed
October 28, 2022

Timeline

  1. October 28, 2022
    Reported to regulator Regulator

    MA AG breach notification: 13 Massachusetts residents affected

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
Confirmed incident

US-MA

Disclosed
June 23, 2021

Timeline

  1. June 23, 2021
    Reported to regulator Regulator

    MA AG breach notification: 2,531 Massachusetts residents affected

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
Confirmed incident

Filed in WA and CA — Unauthorized Access/Disclosure

The same incident was filed separately with 2 jurisdictions within a few days of each other (WA and CA) — shown here as one incident.

Occurred
May 17, 2021
Disclosed
June 18, 2021

Timeline

  1. June 18, 2021
    Reported to regulator Regulator

    WA AG breach notification: 2,560 Washington residents affected

    source
  2. June 23, 2021
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source

Litigation

  • Possible litigation — multiple candidate dockets found, not yet resolved to a single case.
What a California notice means

Governed by Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

Unverified claim

US — Ransomware Attack

This is an unverified claim — it has allegedly happened to this organisation, as posted by a source below, but has not been confirmed by a regulator, a court filing or the organisation’s own disclosure.

Timeline

  1. July 26, 2023
    Claimed by threat actor (unverified) Claim

    Ransomware leak-site claim (ransomware_live)

    source