Cookies can be sent to a client using TLS/SSL to encrypt the cookies, but TLS/SSL is not used by every hosted application since the data being displayed does not require the encryption of the transmission. To safeguard against cookies, especially session cookies, being sent in plaintext, a cookie can be encrypted before transmission. To force a cookie to be encrypted before transmission, the cookie Secure property can be set.
Review the web server documentation and deployed configuration to verify that cookies are encrypted before transmission. If the web server is not configured to encrypt cookies, this is a finding.
Configure the web server to encrypt cookies before transmission.