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Mattermost Mattermost Desktop AppMattermost Desktop App fails to restrict the allow list of domains which NTLM credentials are passed

Risk 44
Severity
7.7
AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermost Desktop App which allows any user on a server without the image proxy enabled to intercept other users credentials via embedding an image that routes to an external web server. Mattermost Advisory ID: MMSA-2026-00651

First published (updated )
CVE-2026-6517

Mattermost Mattermost Desktop AppOverly long URLs crash the Mattermost Desktop App

Risk 27
Severity
6.5
EPSS
0.20%
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Mattermost Desktop App versions <=6.1 5.5.13.0 fail to account for attempting to open extremely long URLs in the Mattermost Desktop App which allows a malicious server owner to crash the application via including a script to call window.open on a very large URL. Mattermost Advisory ID: MMSA-2026-00652

First published (updated )
CVE-2026-8683

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