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CVE-2026-3115

MEDIUM CVSS: 4.3 Published: 2026-03-26 Modified: 2026-06-17

Description

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 Platforms

Mattermost Mattermost Server

Weakness Type

CWE-863

References