A DOM-based XSS vulnerability has been reported to affect QNAP NAS running QTS and QuTS hero. If exploited, this vulnerability allows attackers to inject malicious code. This issue affects: QNAP Systems Inc. QTS versions prior to 18.104.22.1682 Build 20210428. QNAP Systems Inc. QuTS hero versions prior to h22.214.171.1248 Build 20210414. QNAP Systems Inc. QuTScloud versions prior to c126.96.36.1996 Build 20210503. This issue does not affect: QNAP Systems Inc. QTS 4.3.6; 4.3.3.