CVE-2026-26230

LowCVSS 3.8/10Last modified Jun 17, 2026

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

Metrics

CVSS 3.1 3.8/10CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N

Weakness enumeration

CWE-863

Affected software

No affected versions have been published.

Timeline

Published: Mar 16, 2026
Last modified: Jun 17, 2026
NVD status: Analyzed

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