BreachCensus

Yahoo! Inc.

United States of America

Yahoo! Inc. is an organisation in California. It appears on the California Attorney General breach-notification register with 3 confirmed incidents; the most recent notice was filed on December 14, 2016.

Data as of September 6, 2026.

Sources

Confirmed incident

US-CA

Disclosed
December 14, 2016

Timeline

  1. December 14, 2016
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
What a California notice means

Required under Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.

Note: no affected-count is published on this register.

California breach-notification register ↗

Confirmed incident

Filed in CA and WI

The same incident was filed separately with 2 jurisdictions within a few days of each other (CA and WI) — shown here as one incident.

Disclosed
September 22, 2016

Timeline

  1. September 22, 2016
    Reported to regulator Regulator

    CA AG breach notification: an unknown number of California residents affected

    source
  2. September 22, 2016
    Reported to regulator Regulator

    WI AG breach notification: an unknown number of Wisconsin residents affected

    source
Confirmed incident

US-WI

Occurred
January 31, 2014
Disclosed
January 31, 2014

Timeline

  1. January 31, 2014
    Reported to regulator Regulator

    WI AG breach notification: an unknown number of Wisconsin residents affected

    source

Related

Disclosed around the same time