CVE-2026-6517

HighCVSS 7.7/10Last modified Jun 17, 2026

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

Metrics

CVSS 3.1 7.7/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Weakness enumeration

CWE-522

Affected software

No affected versions have been published.

Timeline

Published: Jun 15, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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