CVE-2026-4055 — Insufficient permission validation on cross-team playbook run creation
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 me…
Published: 2026-05-21 · CVSS: 4.3 · CVSS 3.1
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
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7