An unauthenticated attacker can embed a hidden access to a Biller Direct URL in a frame which, when loaded by the user, will submit a cross-site scripting request to the Biller Direct system. This can result in the disclosure or modification of non-sensitive information.
https://www.sap.com/documents/2022/02/fa865ea4-167e-0010-bca6-c68f7e60039b.html