Skip to content
CVE PROGRAM SOURCE RECORD6.3 Medium

CVE-2026-6517

Mattermost Desktop App fails to restrict the allow list of domains which NTLM credentials are passed

Read JSON ↗CVE.org ↗
Status
Published
Published
Updated
Assigning organization
Mattermost

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Mattermost Mattermost

Default version status: unaffected

  • 0 to ≤ 5.5.13affected
  • 6.2.0unaffected
  • 5.13.6.0unaffected

References