The hack was noticed by the Slack security team who made a post on their website announcing the same.
We were recently able to confirm that there was unauthorized access to a Slack database storing user profile information.
We have since blocked this unauthorized access and made additional changes to our technical infrastructure to prevent future incidents.
We have also released two-factor authentication and we strongly encourage all users to enable this security feature.
Though the hack occurred in February, it took more than a month for Slack to announce the hack.
It also announced that it had enabled 2 factor authentication after the hack attack.
Slack has been criticized for its security practices in the past.
In October 2014 for a design flaw which left its chat room names visible and open to anyone.
After a furore online, Slack denied that the design flaw was a bug.
source: www.techworm.net
