Slack resets thousands of user passwords four years after hack

Illustration by Alex Castro / The Verge

Slack says it is resetting the passwords of some of its users after new information has come to light about a security breach from March 2015. Any users who created their account before this date, who have not changed their passwords since, and who do not use single-sign-on can expect to have their passwords reset by the company if it hasn’t happened already. Slack says that around one percent of its users fall into all three of these categories, which ZDNet reports amounts to around 65,000 users.

The company chose to reset the passwords after it learned that a collection of user email addresses and password combinations had been compromised. After an investigation, the company linked the credentials to a hack it suffered in 2015 when…

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