CVE-2026-6341

Incomplete group locking implementation

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 have API-level checks on which groups the user can create issues or attach comments to which allows a user that is member of multiple groups to create issues to a locked group via direct API requests. Mattermost Advisory ID: MMSA-2026-00602

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

Produtos afetados

Mattermost · Mattermost

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Referências

https://mattermost.com/security-updates