People search Day1Company (Fast Campus) data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 1 Day1Company (Fast Campus)-linked incident (1 company-confirmed), with headline counts up to 1M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Day1Company (Fast Campus) breach history matters
Day1Company (Fast Campus) operates in Education (South Korea). Across indexed rows, recurring themes include mixed intrusion and disclosure events. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2026 — up to ~1M instructors/customers across 8 platforms
Verified breach. Day1Company, operator of Fast Campus and related edtech brands, confirmed a personal-data breach after abnormal intrusion into its IT management system on about 9 May 2026. Seoul Economic Daily (19 June 2026) reported eight platforms in scope—Fast Campus, Coloso, Zerobase, MyLight, Newspresso, Respeak, Shiny English, and Wannaspeak—with company estimates ranging from several hundred thousand up to about 1 million people. For some instructors, names, phone numbers, account numbers, resident registration numbers, and Exposed categories include Instructor/customer PII; instructor RRN/account/card numbers for some; customer RRN/CI not held. BreachHistory cites approximately 1M+ affected records in this row. See the fast-campus-day1company 2026 record and canonical BreachHistory entry.
Patterns and analysis
- Mixed intrusion and disclosure events — appears across multiple Day1Company (Fast Campus) 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 Day1Company (Fast Campus) company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/day1company · Latest: fast-campus-day1company2026.
Sources: BreachHistory catalog (1 row for Day1Company (Fast Campus)), company and regulator disclosures cited in individual breach records.