VULNERABILITY INTELLIGENCE

CVE-2026-26230

CVSS score3.8 LOW
EPSS probability0.17%
CISA KEVNot currently listed
Published2026-03-16
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Description

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

Weakness classification

  • responsibledisclosure@mattermost.com: CWE-863

Primary references