Mattermost versions 9.9.x <= 9.9.0, 9.5.x <= 9.5.6, 9.7.x <= 9.7.5, 9.8.x <= 9.8.1 fail to disallow users to set their own remote username, when shared channels were enabled, which allows a user on a remote to set their remote username prop to an arbitrary string, which would be then synced to the local server as long as the user hadn't been synced before.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 9.5.0 | 9.5.7 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.7.0 | 9.7.6 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.8.0 | 9.8.2 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 9.9.0 | 9.9.1 | N/A |
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