GHSA-3q4q-wqm6-hvf3MediumCVSS 5.4

Mattermost has a Missing Authorization vulnerability

Published
October 16, 2025
Last Modified
October 16, 2025

🔗 CVE IDs covered (1)

📋 Description

Mattermost versions 10.10.x <= 10.10.2, 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to validate email ownership during Slack import process which allows attackers to create verified user accounts with arbitrary email domains via malicious Slack import data to bypass email-based team access restrictions.

🎯 Affected products4

  • go/github.com/mattermost/mattermost/server/v8:< 8.0.0-20250822083415-01b95392a450
  • go/github.com/mattermost/mattermost-server:>= 10.10.0, < 10.10.3
  • go/github.com/mattermost/mattermost-server:>= 10.5.0, < 10.5.11
  • go/github.com/mattermost/mattermost-server:>= 10.11.0, < 10.11.3

🔗 References (6)