Remote-collaboration apps like Slack, Trello, WebEx and Microsoft Teams are not immune from cybercriminal attention. A failure to lock down Slack et al could lead to data breaches, brand damage, malware infestations and more. Fortunately, best practices can go a long way to shrinking the risk of these tools. The risk posed by collaboration apps is far from hypothetical, but best practices are key to reducing it. For example, a Slack vulnerability was found in March, which could allow automated account takeovers (ATOs)
Source: https://threatpost.com/beyond-zoom-safe-slack-collaboration-apps/154446/