Lantronix G520 2.6.0.4R6 stable Web Interface cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, was found in Lantronix G520 2.6.0.4R6 stable. This affects an unknown part of the component Web Interface. The manipulation results in cross site scripting. This vulnerability was named CVE-2026-84409. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Lantronix G520 2.6.0.4R6 stable. Affected is some unknown functionality of the component Web Interface. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at ltrxdev.atlassian.net. This vulnerability is traded as CVE-2026-84409 since 09/17/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Lantronix

Name

• G520

Version

• 2.6.0.4R6 stable

License

• commercial

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CPE 2.2info

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