| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.3≥ 10.11.0+incompatible, < 10.11.3+incompatible≥ 10.5.0, < 10.5.11≥ 10.5.0+incompatible, < 10.5.11+incompatible | 10.11.310.11.3+incompatible10.5.1110.5.11+incompatible |
| github.com/mattermost/mattermost-server/v5 | all versions | |
| github.com/mattermost/mattermost-server/v6 | all versions | |
| github.com/mattermost/mattermost/server/v8 | < 8.0.0-20250820115038-ff30b84049f0 | 8.0.0-20250820115038-ff30b84049f0 |
| mattermost server | ≥ 10.11.0, < 10.11.3≥ 10.5.0, < 10.5.11 | 10.11.310.5.11 |
Mattermost versions 10.5.x <= 10.5.10, 10.11.x <= 10.11.2 fail to properly validate guest user permissions when adding channel members which allows guest users to add any team members to their private channels via the /api/v4/channels/{channel_id}/members endpoint
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