CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate arbitrary user's status
CVSS Score
2.7
EPSS Score
0.0%
EPSS Percentile
7th
Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603
| CWE | CWE-862 |
| Vendor | mattermost |
| Product | mattermost |
| Published | Apr 15, 2026 |
| Last Updated | Apr 15, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
Mattermost / Mattermost
10.11.0 ≤ 10.11.12
Credits
daw10