CVE-2026-6541

Medium

Description

Mattermost versions 11.7.x <= 11.7.1, 11.6.x <= 11.6.4, 10.11.x <= 10.11.19 fail to restrict metric configuration changes to the playbook being saved, which allows an authenticated user with team access to alter another user’s playbook metric settings via a crafted import or update request with a foreign metric ID. Mattermost Advisory ID: MMSA-2026-00653

SeverityMedium

CVSS4.3

Exploit probability—

Product

Mattermost Server

PublishedJul 13, 2026

First seenJul 13, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Update

mattermost mattermost_server10.11.20, 11.6.5, 11.7.2 or later

Vendor advisories

mattermost.com/security-updates

Affected products

Product	Affected versions	Fixed in
mattermost mattermost_server	10.11.0 ≤ v < 10.11.20, 11.6.0 ≤ v < 11.6.5, 11.7.0 ≤ v < 11.7.2	10.11.20, 11.6.5, 11.7.2

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