CVE-2026-26230

published 2026-03-16

CVE-2026-26230: Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team…

low 3.8 CVSS 3.1

AV N AC L PR H UI N S U C L I L A N

Mattermost versions 10.11.x <= 10.11.10 fail to properly validate permission requirements in the team member roles API endpoint which allows team administrators to demote members to guest role. Mattermost Advisory ID: MMSA-2025-00531

Affected

2 ranges

Vendor	Product	Version range	Fixed in
mattermost	mattermost	10.11.0 – 10.11.10	—
mattermost	mattermost_server	>= 10.11.0 < 10.11.11	10.11.11

CWE-863