Mattermost versions 9.10.x <= 9.10.1, 9.9.x <= 9.9.2, 9.5.x <= 9.5.8 fail to limit access to channels files that have not been linked to a post which allows an attacker to view them in channels that they are a member of.
| Software | From | Fixed in |
|---|---|---|
| mattermost / mattermost_server | 9.5.0 | 9.5.9 |
| mattermost / mattermost_server | 9.9.0 | 9.9.3 |
| mattermost / mattermost_server | 9.10.0 | 9.10.2 |