| Package | Affected versions | Patched versions |
|---|---|---|
| mattermost desktop | ≥ 6.1.0, ≤ 6.1.5≤ 5.13.0 |
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
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