GiveWP < 4.19.0.1 - Give Worker+ Stored XSS via Form Template Primary Color

The GiveWP WordPress plugin before 4.19.0.1 does not properly sanitise and escape one of its donation form template settings before outputting it inside an HTML attribute, allowing users with a custom form-editing GiveWP WordPress plugin before 4.19.0.1 role to inject arbitrary web scripts that execute in the browser of any visitor or administrator who opens the affected donation form.