Security Advisory

CVE-2026-6342

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-18 07:00:24

Last updated 2026-05-18 14:32:56

Assigner Mattermost

CVSS score 4.3

State PUBLISHED

Description

Mattermost Plugins versions <=11.5 11.1.5 10.13.11 11.3.4.0 fail to appropriately check for valid namespaces which allows plugin users to create subscriptions to groups that were not whitelisted via creating groups that share the same prefix as a whitelisted group. Mattermost Advisory ID: MMSA-2026-00601

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