ZoomEye finds 736,893 exposed Mattermost servers

ZoomEye reported 736,893 fingerprint matches for app="Mattermost" as of September 23, 2026, indicating hundreds of thousands of self-hosted collaboration servers are reachable from the internet, including default port 8065 without TLS.

• ZoomEye recorded 736,893 fingerprint matches for Mattermost
• Data collected from the ZoomEye index on September 23, 2026
• Port 8065 is the default port for the Mattermost server
• Webhooks, bots and access tokens are often stored in chat history