CVE-2026-6343

MEDIUM

Mattermost Playbooks Plugin - Public Playbook Unauthorized Access

Title source: manual
STIX 2.1

Description

Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13, 11.4.x <= 11.4.3 fail to check public/private permissions which allows members without these permissions to access public playbooks via /get.. Mattermost Advisory ID: MMSA-2026-00591

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory
MMSA-2026-00591
https://mattermost.com/security-updates

Scores

CVSS v3 4.3
EPSS 0.0016
EPSS Percentile 6.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-863
Status published
Products (12)
Mattermost/Mattermost 10.11.0 - 10.11.13
mattermost/mattermost 10.11.0 - 10.11.14Go
Mattermost/Mattermost 10.11.14
Mattermost/Mattermost 11.4.0 - 11.4.3
mattermost/mattermost 11.4.0 - 11.4.4Go
Mattermost/Mattermost 11.4.4
Mattermost/Mattermost 11.5.0 - 11.5.1
mattermost/mattermost 11.5.0 - 11.5.2Go
Mattermost/Mattermost 11.5.2
Mattermost/Mattermost 11.6.0
... and 2 more
Published May 18, 2026
Tracked Since May 18, 2026