CVE-2026-4286

Playbooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook update

State: Published
Severity: 3.1 Low
Published: May 18, 2026
Updated: May 18, 2026
Reserved: Mar 16, 2026

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

Scores

CVSS	Score	Vector	Source
3.1	3.1 Low	CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N	Mattermost

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
MattermostMattermost	11.5.0 through 11.5.1Affected 10.11.0 through 10.11.13Affected 11.6.0Not affected 11.5.2Not affected 10.11.14Not affected

References

MMSA-2025-00552vendor-advisory

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