Is CVE-2026-9824 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-9824?

CVE-2026-9824 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-9824

Description

Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to check the manage_shared_channels permission in the /share-channel autocomplete handler, which allows an authenticated user without that permission to enumerate configured remote cluster connection metadata via slash command autocomplete.. Mattermost Advisory ID: MMSA-2026-00676