A cookie can be read by client-side scripts easily if cookie properties are not set properly. By allowing cookies to be read by the client-side scripts, information such as session identifiers could be compromised and used by an attacker who intercepts the cookie. Setting cookie properties (i.e. HttpOnly property) to disallow client-side scripts from reading cookies better protects the information inside the cookie.
Review the web server documentation and deployed configuration to determine how to disable client-side scripts from reading cookies. If the web server is not configured to disallow client-side scripts from reading cookies, this is a finding.
Configure the web server to disallow client-side scripts the capability of reading cookie information.