CVE-2026-4055
Medium · 4.3CVSS
4.3
EPSS
0.3%
Published
May 21, 2026
CISA due date
—
The record
Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create 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. Mattermost Advisory ID: MMSA-2026-00629
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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