Cross-site Scripting (XSS) vulnerability in NAS devices of QNAP Systems Inc. QTS allows attackers to inject javascript. This issue affects: QNAP Systems Inc. QTS version 4.2.6 and prior versions on build 20180711; version 4.3.3 and prior versions on build 20180725; version 4.3.4 and prior versions on build 20180710.