SAP Biller Direct allows an unauthenticated attacker to craft a legitimate looking URL. When clicked by an unsuspecting victim, it will use an unsensitized parameter to redirect the victim to a malicious site of the attacker's choosing which can result in disclosure or modification of the victim's information.
https://www.sap.com/documents/2022/02/fa865ea4-167e-0010-bca6-c68f7e60039b.html