People search ManpowerGroup data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 1 ManpowerGroup-linked incident, with headline counts up to 144K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why ManpowerGroup breach history matters
ManpowerGroup operates in Energy (India). Across indexed rows, recurring themes include ransomware and extortion, 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
2024 — 2024–2025 Manpower (Lansing franchise) — RansomHub-claimed ransomware; ~145k notified
Unverified claim — treat actor counts cautiously. ManpowerGroup stressed corporate network isolation while an independently owned Manpower franchise in Lansing, Michigan investigated a late-December 2024 intrusion detected via January 2025 outage forensics, with Maine regulatory filings ultimately listing roughly 144k affected individuals. BleepingComputer linked the case to RansomHub dark-web marketing of hundreds of gigabytes allegedly holding client dossiers, identity scans, and HR analytics before the listing disappeared. Exposed categories include SSN-class, passport/ID images, staffing client metadata, and internal HR/finance documents per notification letters summarized by trade press. BreachHistory cites approximately 144K+ affected records in this row. See the manpowergroup-lansing-ransomhub2025 and canonical BreachHistory entry.
Patterns and analysis
- Ransomware and extortion — appears across multiple ManpowerGroup catalog entries; prioritize controls that address this class of failure.
- Unverified actor or scraping claims — appears across multiple ManpowerGroup 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 ManpowerGroup company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/manpowergroup · Latest: manpowergroup-lansing-ransomhub2025.
Sources: BreachHistory catalog (1 row for ManpowerGroup), company and regulator disclosures cited in individual breach records.