Security Advisory

CVE-2026-3433

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-06-12 15:46:54

Last updated 2026-06-12 17:19:49

Assigner Mattermost

CVSS score 4.3

State PUBLISHED

Description

Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 fail to restrict role_updated websocket event broadcasts to members of the affected team or channel which allows an authenticated attacker with guest-level access to observe permission scheme change notifications for private teams they are not a member of via the websocket connection.. Mattermost Advisory ID: MMSA-2026-00616

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