On Heel of Massive Funding Round and Valuation, Slack Suffers Security Breach

Slack has suffered a security breach.

In the midst of raising $150 million at a $2.8 billion valuation, the company alerted users via email this morning.

We were recently able to confirm that there was unauthorized access to a Slack database containing user profile information. Since the compromised system was first discovered, we have been working 24 hours a day to methodically examine, rebuild and test each component of our system to ensure it is safe.

Slack went into more detail on its blog.

“Slack maintains a central user database which includes user names, email addresses, and one-way encrypted (“hashed”) passwords. Information contained in this user database was accessible to the hackers during this incident,” the company wrote.

The unauthorized access took place during a period of “approximately four days in February.” No action is required by users, Slack says.

Slack is by far the fastest Canadian-born startup to achieve a $1 billion valuation. Slack raised $120 million at a $1.1 billion valuation last October at less than a year old. As of February, Slack boasts 500,000 daily active users across 60,000 teams.

“Slack radically increases internal transparency and turns communication archives into a powerful shared resource,” Butterfield said earlier this year. “We feel safe predicting all businesses will move a centralized system for communication within the next 10 years.”