EUVD-2026-31221

Mattermost versions 11.5.x = 11.5.1 fail to validate team-level runcreate permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request...

GO-2026-4812 Mattermost fails to verify run_create permission for empty playbookId in github.com/mattermost/mattermost-plugin-playbooks

Mattermost fails to verify runcreate permission for empty playbookId in github.com/mattermost/mattermost-plugin-playbooks...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via the playbook run API when the runcreate permission is not verified for an empty playbookId. An attacker can initiate unauthorized playbook runs by sending crafted API requests. Remediation Upgrade...

Mattermost fails to verify run_create permission for empty playbookId

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2 fail to verify runcreate permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542...

GHSA-4PMX-622H-X359 Mattermost fails to verify run_create permission for empty playbookId

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2 fail to verify runcreate permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542...

CVE-2026-26304

Mattermost versions 11.3.x = 11.3.0, 11.2.x = 11.2.2 fail to verify runcreate permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542...