CVE-2018-19953 QNAP NAS File Station Cross-Site Scripting

Exploited in the wild Medium 6.1 Published 28 Oct 2020 Updated 1 Oct 2026

Remote attackers can inject malicious scripts into QNAP NAS web interfaces, potentially leading to code execution or account takeover.

Exploited in the wild: Since 24 May 2022
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-19953?

CVE-2018-19953 is a medium-severity cross-site scripting vulnerability in Qnap Qts, published on 28 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

If exploited, this cross-site scripting vulnerability could allow remote attackers to inject malicious code. QNAP has already fixed the issue in the following QTS versions. QTS 4.4.2.1231 on build 20200302; QTS 4.4.1.1201 on build 20200130; QTS 4.3.6.1218 on build 20200214; QTS 4.3.4.1190 on build 20200107; QTS 4.3.3.1161 on build 20200109; QTS 4.2.6 on build 20200109.

Weakness: CWE-80, CWE-79

Which versions are affected by CVE-2018-19953?

It affects 1 product.

Products include Qnap Qts.

How do I fix CVE-2018-19953?

No fix has been published for CVE-2018-19953 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 14 Jun 2022.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2018-19953 being exploited?

Yes. Attackers have exploited CVE-2018-19953 in the wild since at least 24 May 2022, including in ransomware campaigns.

All Qnap Qts vulnerabilities

Sources

Also known as GHSA-8h8x-7j55-4jp9.