CVE-2026-4286
Mattermost doesn't check if {{team_id}} was being changed when updating playbooks
3.1
LOW
CVSS 3.1
EPSS 0.03%
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
How to fix CVE-2026-4286
To remediate CVE-2026-4286, upgrade the affected package to a fixed version below.
- —upgrade to 1.41.1-0.20260213020129-e1d6ec2c94e6 or later
- —upgrade to 11.5.2 or later
Is CVE-2026-4286 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.41.1-0.20260213020129-e1d6ec2c94e6
- >= 11.5.0, < 11.5.2
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | LOW3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N |