The chat feature in the Real-Time Collaboration (RTC) services 7.3 and 7.4 in SAP NetWeaver Java AS 7.1 through 7.5 allows remote attackers to obtain sensitive user information by visiting webdynpro/resources/sap.com/tc~rtc~coll.appl.rtc~wd_chat/Chat#, pressing "Add users", and doing a search, aka SAP Security Note 2255990.
https://erpscan.io/press-center/blog/sap-security-notes-march-2016-review/
https://erpscan.io/advisories/erpscan-16-016-sap-netweaver-7-4-information-disclosure-wd_chat/
http://seclists.org/fulldisclosure/2016/Jun/46
http://packetstormsecurity.com/files/137579/SAP-NetWeaver-AS-JAVA-7.5-Information-Disclosure.html