CVE-2026-8821 | Mattermost up to 10.11.22/11.7.7/11.8.4/11.9.0 Playbook Run permission

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A vulnerability was found in Mattermost up to 10.11.22/11.7.7/11.8.4/11.9.0. It has been declared as critical. Affected by this issue is some unknown functionality of the component Playbook Run. Such manipulation leads to permission issues.

This vulnerability is traded as CVE-2026-8821. The attack may be launched remotely. There is no exploit available.

It is recommended to upgrade the affected component.VulDB Recent EntriesRead More