CVE-2026-84409 Lantronix G520 Series Cellular Gateway Cross-site Scripting
An attacker can inject scripts via update metadata to execute arbitrary code with root privileges on the Lantronix G520 gateway.
- 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-2026-84409?
CVE-2026-84409 is a high-severity cross-site scripting vulnerability in Lantronix G520 Series, published on 29 Sep 2026. 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
The device's update mechanism retrieves metadata for software updates over an unencrypted HTTP connection and stores portions of that metadata for later use. A management interface subsequently returns this stored value in a JSON response, and the web interface responsible for displaying update information inserts that value directly into the page as HTML. This behavior allows attacker‑controlled metadata to be interpreted as script content. In addition, the same authenticated origin provides an interface capable of executing system‑level commands with root privileges. An attacker able to influence update metadata could exploit these conditions to execute arbitrary code within the administrative context of the device.
Weakness: CWE-79
Which versions are affected by CVE-2026-84409?
How do I fix CVE-2026-84409?
No fix has been published for CVE-2026-84409 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-2026-84409 being exploited?
There is no known exploitation of CVE-2026-84409 in the wild and no public exploit code.
Sources
Also known as GHSA-32j5-669h-cw7p.