Cloudanix VulnDB

CVE-2026-3115

Medium · 4.3

CVSS

4.3

EPSS

0.3%

Published

Mar 26, 2026

CISA due date

—

The record

Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to apply view restrictions when retrieving group member IDs, which allows authenticated guest users to enumerate user IDs outside their allowed visibility scope via the group retrieval endpoint.. Mattermost Advisory ID: MMSA-2026-00594

Affected packages

Ecosystem Package Introduced Fixed

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