CVE-2026-55730

Deferred Deferred - Pending Action

Reflected XSS in Loytec LWEB-802

Publication date: 2026-07-24

Last updated on: 2026-10-24

Assigner: Switzerland Government Common Vulnerability Program

Description

Reflected Cross-Site Scripting (CWE-79) in LWEB802 in Loytec LWEB-802 before 5.0.8 on all platforms allows an unauthenticated remote attacker to execute arbitrary JavaScript in a victim's browser and perform actions with the victim's privileges via a crafted link containing a malicious `project` or `mspParams` parameter.

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Meta Information

Published

2026-07-24

Last Modified

2026-10-24

Generated

2026-11-08

AI Q&A

2026-07-24

EPSS Evaluated

2026-11-07

NVD

CVE-2026-55730

EUVD

EUVD-2026-48595

Affected Vendors & Products

Vendor	Product	Version / Range
loytec	lweb-802	to 5.0.8 (exc)
loytec	l-roc	*
loytec	l-inx	*
loytec	l-iob	*
loytec	lpad-7	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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.
CWE-116	The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved.

Attack-Flow Graph

Executive Summary

This is a Reflected Cross-Site Scripting (XSS) vulnerability in Loytec LWEB-802 software before version 5.0.8. An unauthenticated remote attacker can trick a user into clicking a malicious link, which executes arbitrary JavaScript in the victim's browser with their privileges. The attack targets the project or mspParams parameters.

Detection Guidance

Detecting this vulnerability requires checking if your LWEB-802 or related Loytec systems are running versions prior to 5.0.8. Inspect the software version via the web interface or system logs. Use network scanning tools like Nmap to identify vulnerable devices by checking open ports and service banners.

Impact Analysis

An attacker could steal session cookies, perform actions on behalf of the user, redirect to malicious sites, or manipulate displayed content. This could lead to unauthorized access to sensitive data or control of the user's browser session.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, potentially violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations may face compliance penalties if exploited.

Mitigation Strategies

Immediately update LWEB-802 to version 5.0.8 or later. If updating is not immediately possible, restrict access to the web interface via network segmentation or firewall rules. Avoid clicking on untrusted links and educate users about phishing risks.

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