Is CVE-2026-10542 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-10542?

CVE-2026-10542 has a CVSS v3 severity of MEDIUM (5).

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CVE-2026-10542

Description

Mattermost versions 11.9.x <= 11.9.0, 11.8.x <= 11.8.4, 11.7.x <= 11.7.7, 10.11.x <= 10.11.22 fail to validate channel action ownership which allows channel managers to update actions in other channels via the channel action update endpoint.. Mattermost Advisory ID: MMSA-2026-00692