CVE-2026-13411 PUBLISHED

Null condition in Playbooks import crashes the plugin

Assigner: Mattermost
Reserved: 26.06.2026 Published: 22.10.2026 Updated: 22.10.2026

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

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 4.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	Mattermost
Product	Mattermost
Versions	Default: unaffected affected from 11.7.0 to 11.7.11 (incl.) Version 11.10.0 is unaffected Version 11.7.12 is unaffected

Solutions

Update Mattermost to versions 11.10.0, 11.7.12 or higher.

Credits

alimursaliyev finder

References

MMSA-2026-00709

Problem Types

CWE-754: Improper Check for Unusual or Exceptional Conditions CWE