Insufficient permission validation on cross-team playbook run creation_CVE-2026-4055

4.3 / 10

MEDIUM

CVSS: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

Basic Information

ID CVE-2026-4055

Source Mattermost

Published May 21, 2026 at 07:13

Affected Product

Vendor Mattermost

Product Mattermost

Version 11.5.0

Affected Versions Mattermost Mattermost 11.5.0

CWE Classification

CWE-863

References

mattermost.com /security-updates

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    "published": "2026-05-21T07:13:31.669Z",
    "modified": "2026-05-21T07:13:31.669Z",
    "type": "cve",
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