CVE-2026-6342

Group prefix matching bypass for subscriptions

CVSS 4.3 MEDIUMEPSS 0.2%CWE-863

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

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Productos afectados

Mattermost · Mattermost

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Referencias

https://mattermost.com/security-updates