| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost server | = 10.0.0≥ 9.10.0, < 9.10.3≥ 9.11.0, < 9.11.2≥ 9.5.0, < 9.5.10 | 9.10.39.11.29.5.10 |
Mattermost versions 9.10.x <= 9.10.2, 9.11.x <= 9.11.1, 9.5.x <= 9.5.9 and 10.0.x <= 10.0.0 fail to properly authorize the requests to /api/v4/channels which allows a User or System Manager, with "Read Groups" permission but with no access for channels to retrieve details about private channels that they were not a member of by sending a request to /api/v4/channels.
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