Yahoo's 2013 hack: largest data breach ever
Yahoo suffered a data breach in a 2013 hack. The incident has been treated as the largest data breach in history, and as of July 2026 it was still regarded as the largest. Specific figures on the damage and the response have not been confirmed.
Key facts
- Affected organisation
- Yahoo
- Incident type
- Data breach
- Occurred / detected
- Not confirmed
- Scale of damage
- Not confirmed
- Cause / method
- Hacking
- Location
- Other countries
If your data was exposed
- Don’t tap links in texts, calls or emails that mention this incident and offer compensation, refunds or breach checks. Check directly on the organisation’s official website or app.
Timeline
- Yahoo's 2013 hack was reported to be the largest ever.
- The Yahoo incident was regarded as the largest data breach of all time.
3 related reports
Other incidents at Yahoo
Alleged leak of 602,000 Yahoo email accounts
Impact: Alleged leak of 602,000 email accounts
Allegations surfaced that 602,000 Yahoo email accounts had been leaked. Hackers were reportedly advertising the account information, and whether a leak actually occurred and the response have not been confirmed.
Related reports: 2 →Two hackers hack Yahoo on 9 December 1997
On 9 December 1997, a pair of hackers hacked Yahoo. The specific scale of the damage, attack method and response have not been confirmed.
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The summary and key facts are written by AI from related reports and may contain errors. Check the original articles and the organisation’s official statements for accurate details.