| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost | = 9.8.0≥ 9.5.0, < 9.5.6 | 9.5.6 |
Mattermost versions 9.5.x <= 9.5.5 and 9.8.0, when using shared channels with multiple remote servers connected, fail to check that the remote server A requesting the server B to update the profile picture of a user is the remote that actually has the user as a local one . This allows a malicious remote A to change the profile images of users that belong to another remote server C that is connected to the server A.
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