CVE-2026-16048

Medium

Open

TLP:CLEAR

Channel member roles accept out-of-scope roles

NVD CVE.org

AI Analysis

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Description

Mattermost versions 11.8.x <= 11.8.2, 11.7.x <= 11.7.6, 10.11.x <= 10.11.21 fail to restrict channel member role assignment to channel-scoped roles which allows a channel administrator to gain additional channel permissions via the channel member roles API.. Mattermost Advisory ID: MMSA-2026-00697

Details

CVSS Score: 6.3
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Confidence: 90%
Published: Aug 17, 2026
Last Modified: Aug 17, 2026

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