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
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250822083415-01b95392a450 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.10.0 | 10.10.3 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.5.0 | 10.5.11 | N/A |
| github.com/mattermost/mattermost-server(Go) | 10.11.0 | 10.11.3 | N/A |
CVSS Metrics
