Yahoo security incident history
Hacking, data breaches and other security incidents involving Yahoo, with related coverage.
Incidents: 3 · Most recent
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 →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.
Related reports: 3 · last report →Two hackers hack Yahoo on December 9, 1997
On December 9, 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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