Safety and data security is of utmost priority for the Mattermost community. If you are a security researcher and have discovered a security vulnerability in our code base, we appreciate your help in disclosing it to us in a responsible manner.

1. Please contact us to report any security vulnerabilities found in our community test server, any of the open source code bases maintained by Mattermost, or any of our commercial offerings.
2. Please refrain from requesting compensation for reporting vulnerabilities.
3. We will acknowledge receipt of your vulnerability report and send you regular updates about our progress.
4. If your report is reproducible as an exploit and results in a change to the code base or documentation of a Mattermost product, we will–at your option–publicly acknowledge your responsible disclosure.
5. After a fix is made, we ask security researchers to wait 30 days after a release before announcing the specific details of a vulnerability, and to provide Mattermost with a link to any such announcements. In releases containing security fixes, Mattermost announces an update is available, acknowledges the contributions of security researchers, and it withholds specific details until 30 days after availability to give time for the community to apply updates.

You are not allowed to search for vulnerabilities on any instance of Mattermost hosted by the team, users, or customers with the exception of non-disruptive testing on the community test server mentioned above.

Mattermost is open source software, you can install a copy yourself and test against that. If you want to perform testing that might break things please contact us to arrange access to a private staging server, so you don’t disrupt other people’s work on the community test server.

Many thanks to the security researchers who have responsibly contributed their findings to make the Mattermost code base more secure (listed in the Security Research Hall of Fame below by number of contributions, then alphabetically).

Mattermost is committed to working with the security community to find security vulnerabilities in order to keep our community and customers safe. Mattermost will make a best effort to respond to incoming reports within 2 business days and make a bounty determination after validating a legitimate security issue within 5 business days. We’ll try to keep you informed throughout the process about the current status and next steps

To learn more about our bug bounty program and participate, please visit this page.

See the Mattermost Security Updates page for a list of security updates by release.