Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552

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Advisories

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Fixes

Solution

Update Mattermost to versions 11.6.0, 11.5.2, 10.11.14 or higher.


Workaround

No workaround given by the vendor.

References
History

Mon, 18 May 2026 19:30:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost mattermost Server
CPEs cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*
Vendors & Products Mattermost mattermost Server

Mon, 18 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 18 May 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Mattermost
Mattermost mattermost
Vendors & Products Mattermost
Mattermost mattermost

Mon, 18 May 2026 09:00:00 +0000

Type Values Removed Values Added
Description Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to check if {{team_id}} was being changed when updating playbooks, allowing users with only {{Manage Playbook Configurations}} permission to change a playbook's team, bypassing manage members restriction via PUT api. Mattermost Advisory ID: MMSA-2025-00552
Title Playbooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook update
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Mattermost

Published:

Updated: 2026-05-18T12:41:28.632Z

Reserved: 2026-03-16T16:29:41.559Z

Link: CVE-2026-4286

cve-icon Vulnrichment

Updated: 2026-05-18T12:41:24.432Z

cve-icon NVD

Status : Analyzed

Published: 2026-05-18T09:16:22.990

Modified: 2026-05-18T19:16:29.587

Link: CVE-2026-4286

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-18T11:30:23Z

Weaknesses