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Mattermost Mattermost Desktop AppPosting a malicious markdown image crashes the Mattermost Desktop App

Risk 38
Severity
6.5
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

First published (updated )
CVE-2026-8075

Mattermost Mattermost Desktop AppMattermost Desktop App crashes when malformed arguments are provided to some exposed IPC methods

Risk 27
Severity
6.5
EPSS
0.24%
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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

First published (updated )
CVE-2026-9602

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