Verizon revealed Yahoo’s 2013 data breach affected all three billion accounts, triple number disclosed in December 2016

Briefing

October 6, 2017

Briefing	Three Billion Affected Accounts – Verizon announced all Yahoo user accounts, numbering three billion, were breached in August 2013 hack, triple number announced in December 2016 and largest data breach to date Corresponding Actions – Following December 2016 announcement, Yahoo required users to change passwords and invalidated unencrypted security questions and answers Hacking Alert – Yahoo will notify users that were not previously alerted of hacking event Passwords Unaffected – New investigation claims stolen information does not include passwords in clear text, payment card data, or bank account information
Accelerator	Cybersecurity
Sector	Information Technology
Organization	Yahoo! Inc.
Source	Larson, S., "Every single Yahoo account was hacked - 3 billion in all", CNN, http://www.cnn.com/; Haselton, T., "Yahoo just said every single account was affected by 2013 attack — 3 billion in all", CNBC, http://www.cnbc.com/; "Yahoo provides notice to additional users affected by previously disclosed 2013 data theft," Oath, https://www.oath.com/; AcceleratingBiz analysis
Original Publication Date	October 3, 2017

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