| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/mattermost/mattermost-server | ≥ 10.11.0, < 10.11.10≥ 10.11.0+incompatible, < 10.11.10+incompatible | 10.11.1010.11.10+incompatible |
| mattermost server | ≥ 10.11.0, < 10.11.10 | 10.11.10 |
Mattermost versions 10.11.x <= 10.11.9 fail to properly validate channel membership at the time of data retrieval which allows a deactivated user to learn team names they should not have access to via a race condition in the /common_teams API endpoint.. Mattermost Advisory ID: MMSA-2025-00549
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