CVE-2026-4286CWE-863broken-access-control

CVE-2026-4286

Low · published May 18, 2026

CVSS v3.1
3.1
EPSS
0%
Percentile
3.3
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
3.1 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00143 · 3.3th percentile
Weakness
CWE-863 · Incorrect Authorization
Published
2026-05-18T13:16Z
Affected products (2)
ProductVersionsFixed in
mattermost/mattermost_server≥ 10.11.0, < 10.11.1410.11.14
mattermost/mattermost_server≥ 11.5.0, < 11.5.211.5.2
References (1)
https://mattermost.com/security-updates · [email protected]
EPSS history
Timeline
  • 18 MAY 08:07Z
    Playbooks Plugin fails to validate team transfers, allowing unauthorized removal of member access via playbook update
    cvelistv5