CVE-2026-55729 in LWEB-802
Summary
by MITRE • 07/24/2026
Exposure of Sensitive Information (CWE-200) in LWEB802 browser `localStorage` in Loytec LWEB-802 before 5.0.8 on all platforms allows an unauthenticated remote attacker to leak stored management credentials via a crafted link.
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Analysis
by VulDB Data Team • 07/24/2026
The vulnerability described represents a critical exposure of sensitive information within the Loytec LWEB-802 web browser implementation that affects versions prior to 5.0.8 across all supported platforms. This weakness falls under CWE-200, which specifically addresses the exposure of sensitive information to unauthorized actors, making it a fundamental security concern that can lead to significant operational compromises.
The technical flaw manifests through the improper handling of authentication credentials within the browser's localStorage mechanism. When management credentials are stored in localStorage, they become accessible to any script running within the same origin, creating a persistent storage vulnerability that persists across browser sessions and page reloads. This particular implementation stores sensitive administrative credentials in an insecure manner that does not adequately protect against unauthorized access or extraction.
The operational impact of this vulnerability is severe as it enables unauthenticated remote attackers to exploit the stored credentials through a crafted link mechanism. This attack vector allows adversaries to remotely access management interfaces without requiring prior authentication, effectively bypassing the security controls designed to protect administrative functions. The implications extend beyond simple credential theft to potential full system compromise, as administrative access typically provides extensive control over network configurations and device management capabilities.
This vulnerability directly maps to several ATT&CK techniques including T1566 for initial access through malicious links and T1078 for valid accounts usage once credentials are obtained. The attack chain begins with the delivery of a malicious link that leverages the browser's localStorage to extract stored credentials, then proceeds to unauthorized system access using those credentials.
Mitigation strategies should focus on implementing proper credential storage practices that avoid using insecure client-side storage mechanisms for sensitive information. Organizations should implement secure credential handling through server-side authentication mechanisms, utilize secure HTTP headers such as Content Security Policy to limit script execution, and ensure that management interfaces require robust multi-factor authentication. Additionally, the affected systems must be updated to version 5.0.8 or later where the vulnerability has been addressed through proper credential storage implementation and access controls. The remediation process should also include comprehensive security audits of all client-side storage mechanisms to identify similar vulnerabilities that may exist in other components of the system architecture.