CVE-2026-4286
published 2026-05-18CVE-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…
PriorityP423medium4.3CVSS 3.1
AVNACLPRLUINSUCNILAN
EPSS
0.14%
4.1th percentile
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 |
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GHSA
Mattermost doesn't check if {{team_id}} was being changed when updating playbooks
ghsa·2026-05-18
CVE-2026-4286 [LOW] CWE-863 Mattermost doesn't check if {{team_id}} was being changed when updating playbooks
Mattermost doesn't check if {{team_id}} was being changed when updating playbooks
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
VulDB
Mattermost up to 10.11.13/11.5.1 PUT Api team_id authorization (EUVD-2026-30750)
vuldb·2026-05-18·CVSS 4.3
CVE-2026-4286 [MEDIUM] Mattermost up to 10.11.13/11.5.1 PUT Api team_id authorization (EUVD-2026-30750)
A vulnerability was found in Mattermost up to 10.11.13/11.5.1. It has been rated as problematic. This vulnerability affects unknown code of the component PUT Api. Performing a manipulation of the argument team_id results in incorrect authorization.
This vulnerability is known as CVE-2026-4286. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is advised.
GHSA
GHSA-gvg4-jhmr-6j23: Mattermost versions 11
ghsa_unreviewed·2026-05-18
CVE-2026-4286 [LOW] CWE-863 GHSA-gvg4-jhmr-6j23: Mattermost versions 11
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
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-05-18
Published