{"id":"CVE-2026-26230","details":"Mattermost versions 10.11.x \u003c= 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","modified":"2026-04-10T05:41:00.081438Z","published":"2026-03-16T21:16:33.480Z","references":[{"type":"ADVISORY","url":"https://mattermost.com/security-updates"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mattermost/mattermost-server","events":[{"introduced":"5b955468ea1ea8b56c0fb10feb258a36a767d7bb"},{"fixed":"fddd4a70bcb32eaff394a2fa5399efcd1b2ae251"}],"database_specific":{"versions":[{"introduced":"10.11.0"},{"fixed":"10.11.11"}]}}],"versions":["@mattermost/client@10.11.0","@mattermost/types@10.11.0","mattermost-redux@10.11.0","v10.11.0","v10.11.0-rc3","v10.11.1","v10.11.1-rc1","v10.11.10","v10.11.11-rc1","v10.11.2","v10.11.2-rc1","v10.11.2-rc2","v10.11.3","v10.11.4","v10.11.4-rc1","v10.11.4-rc2","v10.11.4-rc3","v10.11.5","v10.11.6","v10.11.7","v10.11.8","v10.11.9","v10.11.9-rc1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-26230.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N"}]}