CVEvulnerability

CVE-2026-6517

7.7 HIGH Published 2026-06-15 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-06-15
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.3 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
CVSS 3.1 ([email protected])
7.7 HIGH — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Weaknesses
CWE-522

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

Affected configurations

• mattermost mattermost desktop (<= 5.13.0) • mattermost mattermost desktop (>= 6.1.0 <= 6.1.5)

Related

Weakness · CWE (1)

  • CWE-522 Insufficiently Protected Credentials weakness

References