GHSA-WXJ2-QC9P-65R3 Jenkins Mattermost Notification Plugin vulnerable to SSRF

A server-side request forgery vulnerability exists in Jenkins Mattermost Notification Plugin 2.6.2 and earlier in MattermostNotifier.java that allows attackers with Overall/Read permission to have Jenkins connect to an attacker-specified Mattermost server and room and send a message...