---
id: CVE-2026-13411
title: Null condition in Playbooks import crashes the plugin
summary: >-
  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 nu…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-754
vendor: Mattermost
product: Mattermost
affected:
  - Mattermost >= 11.7.0 <= 11.7.11
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T10:46:05.465Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-13411'
references:
  - url: 'https://mattermost.com/security-updates'
    label: MMSA-2026-00709
tags:
  - cve.org
ingestedAt: '2026-10-22T11:37:02.350Z'
---

## Overview

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

## Affected

- `Mattermost >= 11.7.0 <= 11.7.11`

## Remediation

Update Mattermost to versions 11.10.0, 11.7.12 or higher.