CVE-2026-13411: Mattermost 11.7.0 through 11.7.11

Affected technology

Mattermost · 11.7.0 through 11.7.11
Mattermost

Description’s affected range: versions 11.7.x <= 11.7.11 fail to validate null elements when decoding playbook import conditions which

Component: Not specified by the source

Attack conditions (Vendor/CNA, CVSS 3.1): Network (remote) · Low privileges required · No user interaction required

What an attacker can do

The source says 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. Vendor/CNA’s CVSS 3.1 assessment (base score 4.3/10) rates confidentiality and integrity impact as none; availability impact as low.