Is CVE-2026-13411 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-13411?

CVE-2026-13411 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-13411

Description

Mattermost versions 11.7.x <= 11.7.11 fail to validate null elements when decoding playbook import conditions which allows an authenticated attacker to crash the Playbooks plugin instance-wide via a crafted import request containing a null condition. Mattermost Advisory ID: MMSA-2026-00709