Cross-site scripting vulnerability in QTS and QuTS hero

published 2020-12-10 5y ago modified 2026-06-17 4mo ago also EUVD-2020-22288

cvss: 6.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code in File Station. QANP have already fixed these vulnerabilities in the following versions of QTS and QuTS hero. QuTS hero h4.5.1.1472 build 20201031 and later QTS 4.5.1.1456 build 20201015 and later QTS 4.4.3.1354 build 20200702 and later QTS 4.3.6.1333 build 20200608 and later QTS 4.3.4.1368 build 20200703 and later QTS 4.3.3.1315 build 20200611 and later QTS 4.2.6 build 20200611 and later

Patch / fix

fixed in 2

qnap quts_hero 4.5.1.1472
qnap qts 4.2.6, 4.3.3.1315, 4.3.4.1368, 4.3.6.1333, 4.4.3.1354, 4.5.1.1456

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Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

QNAP Systems Inc. QTS
QNAP Systems Inc. QuTS hero

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page

References

qnap.com /en/security-advisory/qsa-20-12
vendor-advisory

Sources

CVE List CVE-2020-2495
NVD CVE-2020-2495

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