CVE-2026-4055

MEDIUM CVSS 4.3 View on NVD ↗

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

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Affected Products

mattermost/mattermost_server

References

https://mattermost.com/security-updates

Published: May 21, 2026 08:16 UTC Modified: May 21, 2026 19:45 UTC