People search Department of Homeland Security data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 5 Department of Homeland Security-linked incidents (1 company-confirmed), with headline counts up to 246K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Department of Homeland Security breach history matters
Department of Homeland Security operates in Government (United States). Across indexed rows, recurring themes include unverified actor or scraping claims. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2026 — Homeland Security Information Network (HSIN) intrusion; World Cup security coordination platform accessed
Verified breach. Verified incident — reported June 30–July 1, 2026. Nextgov/FCW and BleepingComputer reported that an unknown threat actor accessed the Department of Homeland Security's Homeland Security Information Network (HSIN) in recent weeks, potentially exposing sensitive but unclassified data shared among federal, state, local, and industry partners. DHS investigators are probing the intrusion; the actor's affiliation and whether documents were exfiltrated remain unclear. The Office of Intelligence and Analysis conducted a d Exposed categories include Unclassified but sensitive information exchanged on HSIN among federal, state, local, territorial, tribal, international, and private-sector partners—including event security coord. No attested victim count is published for this row yet. See the dhs-hsin-intrusion 2026 record and canonical BreachHistory entry.
2026 — Hacktivist breach, contract data (Department of Peace)
Unverified claim — treat actor counts cautiously. Hacktivist group 'Department of Peace' claimed breach of DHS March 2, 2026. DDoSecrets published stolen documents: contracts between DHS, ICE, and 6,000+ companies (Anduril, L3Harris, Raytheon, Palantir, Microsoft, Oracle). Data from Office of Industry Partnership. 4K+ ICE identities exposed. Motivation: recent federal agent killings in Minneapolis. Exposed categories include ICE contract data, company procurement records, 4K+ ICE identities. No attested victim count is published for this row yet. See the dhs 2026 record and canonical BreachHistory entry.
2017 — — Department of Homeland Security: A data breach at the Department of Homeland…
Cataloged incident. A data breach at the Department of Homeland Security has exposed the personal information of more than 240,000 current and former DHS employees, such as their social security numbers, dates of birth, positions, grades, and duty stations, the agency said. On January 3, 2018, select DHS employees received notification letters that they may have been impacted by a privacy incident related to the DHS Office of Inspector General (OIG) Case Management System. The privacy incident did not stem from a Exposed categories include Personal information. BreachHistory cites approximately 246K+ affected records in this row. See the dhs2017 and canonical BreachHistory entry.
2016 — — 30k records
Cataloged incident. Poor security. 30k records. Exposed categories include Names, emails, addresses, and other PII. BreachHistory cites approximately 300 affected records in this row. See the dhs2016 and canonical BreachHistory entry.
2006 — — Department of Homeland Security: A computer storage device that may have held the…
Cataloged incident. A computer storage device that may have held the personal information of current and former employees was lost or stolen. The device had names, Social Security numbers, addresses and telephone numbers. The device was discovered missing on October 16 at the Transportation Security Administration's command center at Portland International Airport. Exposed categories include Personal information. BreachHistory cites approximately 900 affected records in this row. See the dhs2006 and canonical BreachHistory entry.
Patterns and analysis
- Unverified actor or scraping claims — appears across multiple Department of Homeland Security catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Bookmark the Department of Homeland Security company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/dhs · Latest: dhs-hsin-intrusion2026.
Sources: BreachHistory catalog (5 rows for Department of Homeland Security), company and regulator disclosures cited in individual breach records.