Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another channel members Desktop App via posting a malicious link with an embedded image that misses one of those headers. Mattermost Advisory ID: MMSA-2026-00668
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:*:*:*:*:*:*:*:*
|
5.5.13
|
5.13.6
|
|
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
|