People search Deloitte data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 Deloitte-linked incidents, with headline counts up to 700K+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Deloitte breach history matters
Deloitte operates in Technology (India). Across indexed rows, recurring themes include credential theft and social engineering, third-party and supply-chain exposure. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2024 — 2024–2026 Deloitte / RIBridges (Rhode Island) — ~644–700k residents; Brain Cipher; Apr 2026 $7M settlement
Unverified claim — treat actor counts cautiously. Rhode Island’s RIBridges public-benefits and eligibility platform, implemented with Deloitte as a key vendor, suffered a protracted incident publicly tied to a July 2024 intrusion attributed in state-facing reporting to the “Brain Cipher” criminal group and compromised Deloitte-side credentials. State summaries and class-action style coverage described personal information for on the order of 644,000–700,000 individuals. In April 2026, Rhode Island and news outlets (e.g., Rhode Island Current, Providence Business N Exposed categories include Resident PII in benefit system scope per public summaries—fields vary by person. BreachHistory cites approximately 700K+ affected records in this row. See the deloitte-ribridges-rhode-island2024 and canonical BreachHistory entry.
2017 — 350 client emails, admin account compromise
Cataloged incident. Deloitte, one of the Big Four accounting firms, suffered a breach when attackers gained access to the firm's email server through an administrator account that lacked two-factor authentication. The breach exposed confidential emails of 350 clients. Exposed categories include Client emails, usernames, passwords, IP addresses. No attested victim count is published for this row yet. See the deloitte2017 and canonical BreachHistory entry.
Patterns and analysis
- Credential theft and social engineering — appears across multiple Deloitte catalog entries; prioritize controls that address this class of failure.
- Third-party and supply-chain exposure — appears across multiple Deloitte 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: Review OAuth app permissions and revoke unused third-party integrations.
- Step 5: Bookmark the Deloitte company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/deloitte · Latest: deloitte-ribridges-rhode-island2024.
Sources: BreachHistory catalog (2 rows for Deloitte), company and regulator disclosures cited in individual breach records.