Mattermost versions 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post types, which allows attackers to deny service to users with the sysconsole_read_plugins permission via creating a post with the custom_pl_notification type and specific props.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| github.com/mattermost/mattermost/server/v8(Go) | 9.11.0 | 9.11.16 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.0.0 | 10.0.4 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.1.0 | 10.1.4 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 10.2.0 | 10.2.1 | N/A |
| github.com/mattermost/mattermost/server/v8(Go) | 0 | 8.0.0-20250102081831-64c566a8280b | N/A |
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