Description
Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15 fail to sanitize the Remote Cluster API response on PATCH operations, which allows authenticated users with the {{manage_secure_connections}} permission to obtain remote cluster authentication tokens via a PATCH request to the remote cluster endpoint.. Mattermost Advisory ID: MMSA-2026-00662
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected products
- Mattermost / Mattermost11.6.0 – 11.6.1
- Mattermost / Mattermost11.5.0 – 11.5.4
- Mattermost / Mattermost10.11.0 – 10.11.15
- Mattermost / Mattermost11.7.0 – 11.7.0
- Mattermost / Mattermost11.6.2 – 11.6.2
- Mattermost / Mattermost11.5.5 – 11.5.5
- Mattermost / Mattermost10.11.17 – 10.11.17