CVE-2026-4286

published 2026-05-18

CVE-2026-4286: 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…

medium 4.3 CVSS 3.1

AV N AC L PR L UI N S U C N I L A N

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

Affected

7 ranges

Vendor	Product	Version range	Fixed in
github.com	mattermost_mattermost-plugin-playbooks	>= 0 < 1.41.1-0.20260213020129-e1d6ec2c94e6	1.41.1-0.20260213020129-e1d6ec2c94e6
github.com	mattermost_mattermost_server_v8	>= 10.11.0 < 10.11.14	10.11.14
github.com	mattermost_mattermost_server_v8	>= 11.5.0 < 11.5.2	11.5.2
mattermost	mattermost	10.11.0 – 10.11.13	—
mattermost	mattermost	11.5.0 – 11.5.1	—
mattermost	mattermost_server	>= 10.11.0 < 10.11.14	10.11.14
mattermost	mattermost_server	>= 11.5.0 < 11.5.2	11.5.2

CWE-863