CVE-2026-6517

7.7 Élevée

Publiée le 15/06/2026 à 16:16 · Modifiée le 17/06/2026 à 13:00 · Analysée par le NVD · Source : responsibledisclosure@mattermost.com

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

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Produits concernés

Mattermost
Mattermost mattermost desktop

Scores CVSS

Version	Score	Source	Vecteur
3.1	6.3 Moyenne	responsibledisclosure@mattermost.com	`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N`
3.1	7.7 Élevée	nvd@nist.gov (NVD)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`

Faiblesses (CWE)

CWE-522

Références

https://mattermost.com/security-updates Vendor Advisory

Ailleurs

NVD
CVE.org
CIRCL Vulnerability-Lookup
CERT-FR
GitHub Advisories