VULNERABILITY INTELLIGENCE

CVE-2026-4055

CVSS score4.3 MEDIUM
EPSS probability0.15%
CISA KEVNot currently listed
Published2026-05-21
Last modified2026-07-23
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Description

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

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references