Mattermost Desktop App versions <=6.2 6.0.2 5.6.13.0 fail to validate payloads sent from the Mattermost Web App to the Desktop App which allows a malicious server owner to crash the Mattermost Desktop App via changing the payload of a method to a malformed one. Mattermost Advisory ID: MMSA-2026-00678
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 3
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Mattermost Mattermost_Desktop
cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*
|
5.6.13
|
5.13.7
|
|
Mattermost Mattermost_Desktop
cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*
|
6.0.2
|
6.2.1
|
|
Mattermost Mattermost_Desktop
cpe:2.3:a:mattermost:mattermost_desktop:*:*:*:*:*:*:*:*
|
> 6.2.1
|
6.3
|