CVE-2026-6517

CVSS Score & Metrics

Base Score

6.3 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N                                    

Vulnerability Description

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

Vulnerability Details

Published Date

June 15, 2026

Last Modified

June 17, 2026

CWE ID

CWE-522

Source

NVD

Vendor

mattermost

Product

mattermost_desktop

External References

https://mattermost.com/security-updates

CVSS Score & Metrics

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Vulnerability Details

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