CVE-2020-2503 Stored cross-site scripting vulnerability in QES

Critical 9.0 Published 24 Dec 2020 Updated 17 Sep 2024

Remote attackers can inject malicious scripts into QNAP QES File Station, potentially leading to code execution or account takeover.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2020-2503?

CVE-2020-2503 is a critical cross-site scripting vulnerability in QNAP Systems Inc. QES, published on 24 Dec 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

If exploited, this stored cross-site scripting vulnerability could allow remote attackers to inject malicious code in File Station. QNAP has already fixed these issues in QES 2.1.1 Build 20201006 and later.

Weakness: CWE-80, CWE-79, CWE-749

Which versions are affected by CVE-2020-2503?

It affects 1 product.

Products include Qnap Qes.

How do I fix CVE-2020-2503?

No fix has been published for CVE-2020-2503 yet. Limit exposure of the affected software until one is available.

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-2020-2503 being exploited?

There is no known exploitation of CVE-2020-2503 in the wild and no public exploit code.

Sources

Also known as GHSA-v96c-c8j8-qhm7.