CVE-2026-26304

MEDIUM

Permission Bypass in Playbook Run Creation

Title source: cna
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2025-00542
https://mattermost.com/security-updates

Scores

CVSS v3 4.3
EPSS 0.0004
EPSS Percentile 12.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-863
Status published
Products (7)
Mattermost/Mattermost 11.2.0 - 11.2.2
Mattermost/Mattermost 11.2.3
Mattermost/Mattermost 11.3.0
Mattermost/Mattermost 11.3.1
Mattermost/Mattermost 11.4.0
mattermost/mattermost-plugin-playbooks 0 - 1.41.1-0.20260316224925-705f54a81841Go
mattermost/mattermost_server 11.2.0 - 11.2.3
Published Mar 16, 2026
Tracked Since Mar 17, 2026