Uninstalling Mattermost Launcher for Windows (64-bit), then reinstalling keeps you logged in without authentication

Hello Team, Hope you are doing great and enjoying a lot. This issue affected me directly and I was very amazed by it, so I felt it was important to report it in case it was not known. It is resulting unintended behavior: In addition to this report is very similar to both of already been Resolved hackerone reports https://hackerone.com/reports/238260 https://hackerone.com/reports/1278261 Steps to reproduce: 1) Install The Mattermost Desktop App for Windows (64-bit). 2) Enter the Display name with Server URL 3) Login to Mattermost Desktop App 4) Uninstall Mattermost Desktop App 5) Reinstall Mattermost Desktop App Conclusion: You will automatically be logged back in to your account, even though you uninstalled Mattermost Desktop App from your computer and did not enter a username/password to login to the fresh Mattermost Desktop App installation. Thanks and have a good day ;) Regards @annonmous ## Impact The Mattermost Desktop App uninstall process is fully automatic, there is no prompt or indication that there is data left behind. I believe it is reasonable to expect that when uninstalling Mattermost Desktop App users session data should have been removed. If I am a user on a shared user account (for example, if I borrowed a computer and I installed Mattermost Desktop App, but uninstalled it later), they can take full control of my account after the fact. When testing this, I could access all of my messages and data, and even access the Mattermost Desktop App admin panel for my team that I am an administrator of.