Mattermost security updates 9.2.3 / 9.1.4 / 9.0.5 / 8.1.7 (ESR) released

We’re informing you about a Mattermost security update, which addresses low- to medium-level severity vulnerabilities. We highly recommend that you apply the update.

The security update is available for Mattermost dot releases 9.2.3, 9.1.4, 9.0.5, and 8.1.7 (Extended Support Release), for both Team Edition and Enterprise Edition. They are available for download here.

Customer safety and data security are the utmost priorities for Mattermost. For our customers’ protection, and as outlined in our Responsible Disclosure policy, Mattermost does not disclose specifics on this vulnerability until 30 days after this announcement. After 30 days, we will publish specific details on the vulnerability on our Security Updates webpage.

9.2.3, 9.1.4 and 9.0.5 versions also include the following fix:

• Pre-packaged Calls plugin version v0.21.1.

8.1.7 version also includes the following fixes:

• Pre-packaged Calls plugin version v0.21.1.
• Fixed an issue where users couldn’t at-mention custom groups in group-constrained teams and channels.

You can follow the standard upgrade instructions to apply the updates.