| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | ≥ 8.1.0, < 8.1.13≥ 9.5.0, < 9.5.4≥ 9.7.0, < 9.7.2 | 8.1.139.5.49.7.2 |
Mattermost versions 9.5.x <= 9.5.3, 9.7.x <= 9.7.1 and 8.1.x <= 8.1.12 fail to perform a proper authorization check in the /api/v4/groups/<group-id>/channels/<channel-id>/link endpoint which allows a user to learn the members of an AD/LDAP group that is linked to a team by adding the group to a channel, even if the user has no access to the team.
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