The Yahoo breaches of 2013-14 ultimately affected around 3 billion accounts, still the record for a single organisation, and were disclosed in 2016.
Key facts
- Affected approximately 3 billion user accounts, every Yahoo account at the time.
- Occurred in 2013-14 but was not disclosed until 2016.
- Attributed in part to Russian-linked actors.
- Materially affected Yahoo’s valuation during its acquisition by Verizon.
The lesson
Yahoo is the largest breach by record count, though much was stale email data. It is a reminder that delayed disclosure compounds harm.
How DarkThreatX helps
DarkThreatX monitors the dark web for breached records, leaked credentials and exposed data tied to your organisation, so you can detect exposure early. Run a free dark web scan or explore the platform.
