CVE-2026-84409: CWE-79 in Lantronix G520 Series
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.
AI Analysis
Technical Summary
The Lantronix G520 Series devices have a vulnerability where update metadata is fetched over unencrypted HTTP and stored. This stored metadata is later returned in a JSON response and directly inserted into the web interface as HTML without sanitization, leading to a cross-site scripting (CWE-79) vulnerability. Furthermore, the same authenticated origin provides an interface capable of executing system-level commands with root privileges. If an attacker can influence the update metadata, they can exploit this chain to execute arbitrary code within the administrative context of the device. The vulnerability has a CVSS v3.1 score of 7.5 (AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code with root privileges on the affected device by leveraging cross-site scripting via update metadata manipulation combined with an authenticated command execution interface. This can lead to full compromise of the device, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the device's management interface to trusted users only and avoid exposing it to untrusted networks. Monitor for any updates from Lantronix regarding patches or mitigations.
CVE-2026-84409: CWE-79 in Lantronix G520 Series
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.
CVSS v3.1
Score 7.5high
Affected software
Lantronix
G520 Series
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Lantronix G520 Series devices have a vulnerability where update metadata is fetched over unencrypted HTTP and stored. This stored metadata is later returned in a JSON response and directly inserted into the web interface as HTML without sanitization, leading to a cross-site scripting (CWE-79) vulnerability. Furthermore, the same authenticated origin provides an interface capable of executing system-level commands with root privileges. If an attacker can influence the update metadata, they can exploit this chain to execute arbitrary code within the administrative context of the device. The vulnerability has a CVSS v3.1 score of 7.5 (AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H).
Potential Impact
Successful exploitation allows an attacker to execute arbitrary code with root privileges on the affected device by leveraging cross-site scripting via update metadata manipulation combined with an authenticated command execution interface. This can lead to full compromise of the device, including confidentiality, integrity, and availability impacts.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, restrict access to the device's management interface to trusted users only and avoid exposing it to untrusted networks. Monitor for any updates from Lantronix regarding patches or mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- icscert
- Date Reserved
- 2026-09-17T19:24:31.388Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6abc2bf6680226ef684cb660
Added to database: 09/29/2026, 21:21:58 UTC
Last enriched: 09/29/2026, 21:36:15 UTC
Last updated: 09/30/2026, 03:38:31 UTC
Views: 11
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