Mattermost Playbooks plugin denial of service vulnerability

A denial-of-service vulnerability exists in Mattermost Playbooks plugin version 1.24.0 and earlier, which stems from a limit on the number of webhooks that are not properly checked, and can be exploited by an authenticated attacker to trigger a denial of service by creating a specially drafted Playbook, triggering a large number of webhook requests that result in a denial of service.