Mattermost Playbooks Plugin Null Element Decoding CVE-2026-13411 (pre 11.7.12)
CVE-2026-13411 Published on October 22, 2026
Null condition in Playbooks import crashes the plugin
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
Vulnerability Analysis
CVE-2026-13411 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a small impact on availability.
Weakness Type
Improper Check for Unusual or Exceptional Conditions
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.
Products Associated with CVE-2026-13411
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Affected Versions
Mattermost:- Version 11.7.0, <= 11.7.11 is affected.
- Version 11.10.0 is unaffected.
- Version 11.7.12 is unaffected.