Is CVE-2026-86348 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-86348?

CVE-2026-86348 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-86348

Description

Mattermost versions <=11.9 11.0.9 11.4.8 11.7.7 10.22.11.0 fail to recover from handler panics, which allows an authenticated user to crash the plugin via a post-action request with an unexpected field type.. Mattermost Advisory ID: MMSA-2026-00701