CVE-2021-38677 Reflected XSS Vulnerability in QcalAgent

Medium 5.3 Published 14 Jan 2022 Updated 17 Sep 2024

Remote attackers can inject malicious code via reflected XSS in QNAP QcalAgent, potentially compromising user sessions or devices.

Exploited in the wild: Not known
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-2021-38677?

CVE-2021-38677 is a medium-severity cross-site scripting vulnerability in QNAP Systems Inc. QcalAgent, published on 14 Jan 2022. 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

A cross-site scripting (XSS) vulnerability has been reported to affect QNAP device running QcalAgent. If exploited, this vulnerability allows remote attackers to inject malicious code. We have already fixed this vulnerability in the following versions of QcalAgent: QcalAgent 1.1.7 and later

Weakness: CWE-79

Which versions are affected by CVE-2021-38677?

It affects 1 product.

Products include Qnap Qcalagent.

How do I fix CVE-2021-38677?

No fix has been published for CVE-2021-38677 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-2021-38677 being exploited?

There is no known exploitation of CVE-2021-38677 in the wild and no public exploit code.

Sources

Also known as GHSA-63xm-g7fg-g945.