Yahoo Security Notice (December 14, 2016)
Below you’ll find a link to the text of the emails (in your region) sent to Yahoo users potentially affected by the security issues we reported on December 14, 2016. Separately, we include below links to the text of the emails (in each region) that were previously sent to Yahoo users potentially affected by the security issue we reported on September 22, 2016.
The emails from Yahoo about these issues do not ask you to click on any links or contain attachments and do not request your personal information. If an email you receive about these issues prompts you to click on a link, download an attachment, or asks you for information, the email was not sent by Yahoo and may be an attempt to steal your personal information. Avoid clicking on links or downloading attachments from such suspicious emails.
Please note that you'll receive a prompt in the desktop version of Yahoo Mail explaining that "Your account may have been affected by a security issue." This is a legitimate message from Yahoo and the link will bring you to the security issue FAQs page.
View the Yahoo Security Notice email for your region
December 14, 2016 Security Issues
September 22, 2016 Security Issue