CVE-2026-26304 MEDIUM

CVE-2026-26304: Permission Bypass in Playbook Run Creation

Vendor Mattermost
Product Mattermost
Weakness CWE-863 · Incorrect authorization
Published March 16, 2026
Last update March 17, 2026
View on NVD All CVEs

CVSS base score

4.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality None
Integrity Low

CVSS vector

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

What the vulnerability does

01Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2 fail to verify run_create permission for empty playbookId, which allows team members to create unauthorized runs via the playbook run API. Mattermost Advisory ID: MMSA-2025-00542

Key dates

02Disclosure timeline

March 16, 2026 CVE published
March 17, 2026 Record updated