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CVE-2026-6342

MEDIUM CVSS: 4.3 Published: 2026-05-18 Modified: 2026-06-17

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

Affected Platforms

Mattermost Mattermost Server

Weakness Type

CWE-863

References