Is CVE-2026-16048 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-16048?

CVE-2026-16048 has a CVSS v3 severity of MEDIUM (6.3).

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CVE-2026-16048

Description

Mattermost versions 11.8.x <= 11.8.2, 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697