Security Advisory

CVE-2026-21386

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-03-16 14:51:43

Last updated 2026-03-16 18:39:14

Assigner Mattermost

CVSS score 4.3

State PUBLISHED

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to use consistent error responses when handling the /mute command which allows an authenticated team member to enumerate private channels they are not authorized to know about via differing error messages for nonexistent versus private channels. Mattermost Advisory ID: MMSA-2026-00588

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