Where do you find alerts about Jenkins security issues?

Beekeeper Upgrade Assistant if you are running CloudBees Jenkins Distribution or CloudBees Core.

An email message that is automatically sent to all users who have registered with the mailing list at Jenklnssd-advisories@googlegroups.com.

A banner displayed in the upper right section of the master's home page.

An email message sent to all users who are listed in the "Send security notifications'' field of the "Extended E-mail Notification" configuration.

Jenkins logs.