Mattermost versions 10.5.x <= 10.5.5, 9.11.x <= 9.11.15, 10.8.x <= 10.8.0, 10.7.x <= 10.7.2, 10.6.x <= 10.6.5 fail to properly validate channel membership when retrieving playbook run metadata, allowing authenticated users who are playbook members but not channel members to access sensitive information about linked private channels including channel name, display name, and participant count through the run metadata API endpoint.
The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Mattermost_server | Mattermost | 9.11.0 (including) | 9.11.16 (excluding) |
Mattermost_server | Mattermost | 10.5.0 (including) | 10.5.6 (excluding) |
Mattermost_server | Mattermost | 10.6.0 (including) | 10.6.6 (excluding) |
Mattermost_server | Mattermost | 10.7.0 (including) | 10.7.3 (excluding) |
Mattermost_server | Mattermost | 10.8.0 (including) | 10.8.0 (including) |
Mattermost_server | Mattermost | 10.8.0-rc1 (including) | 10.8.0-rc1 (including) |
Mattermost_server | Mattermost | 10.8.0-rc2 (including) | 10.8.0-rc2 (including) |
Mattermost_server | Mattermost | 10.8.0-rc3 (including) | 10.8.0-rc3 (including) |
Assuming a user with a given identity, authorization is the process of determining whether that user can access a given resource, based on the user’s privileges and any permissions or other access-control specifications that apply to the resource. When access control checks are incorrectly applied, users are able to access data or perform actions that they should not be allowed to perform. This can lead to a wide range of problems, including information exposures, denial of service, and arbitrary code execution.