CVE-2026-88738 in RT1000 Edge webUI
Summary
by MITRE • 09/22/2026
Jazzware RT1000 Edge webUI v. 20.0.1 contains an unrestricted file upload vulnerability in the upgrade package upload functionality. An authenticated attacker can upload a server-side executable file. The uploaded file is stored in a web-accessible executable location and can be accessed directly over HTTP without authentication, resulting in remote code execution.
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Analysis
by VulDB Data Team • 09/22/2026
The Jazzware RT1000 Edge device running firmware version 20.0.1 contains a critical security flaw within its web-based management interface that allows for unrestricted file uploads during the system upgrade process. This vulnerability stems from insufficient validation of uploaded files, specifically failing to enforce strict type checking or content verification on the package submitted by the user. While authentication is required to access the upload functionality, this barrier only ensures that an attacker has valid credentials rather than preventing malicious intent once inside the administrative context. The core technical failure lies in the server-side handling of these uploads, where the application does not adequately sanitize file extensions or inspect file headers before saving them to disk. Consequently, an authenticated user can bypass standard restrictions and upload arbitrary executable files, such as shell scripts or compiled binaries, directly onto the device's filesystem.
The operational impact of this vulnerability is severe because it leads directly to remote code execution with elevated privileges. The uploaded malicious payload is not stored in a restricted directory but rather in a web-accessible location that serves static content without requiring further authentication checks. This architectural design flaw means that once an attacker uploads their exploit, they can simply request the file via HTTP from any client on the network or internet if exposed. By executing this script through the browser interface, the attacker gains full control over the underlying operating system of the edge device. In industrial and enterprise environments where such devices are often deployed as critical infrastructure components, this level of access allows for complete compromise of network integrity, potential lateral movement to other systems, and disruption of essential services dependent on the RT1000 Edge hardware.
From a classification perspective, this vulnerability aligns with CWE-434, which describes the unrestricted upload of files with dangerous types. The lack of proper validation against a whitelist of allowed file extensions or MIME types is the primary technical deficiency. Furthermore, the ability to execute these uploaded files via HTTP without additional authentication maps closely to CWE-94, specifically in contexts where code injection occurs through user-controlled data that is subsequently executed by the server. In terms of adversary tactics, this scenario exemplifies techniques found in the MITRE ATT&CK framework under Initial Access and Execution phases. An attacker would leverage valid credentials (Credential Access) to upload a web shell or backdoor (T1505.003 - Web Shell), which then allows them to execute commands on the remote system (T1059 Command and Scripting Interpreter).
Mitigation strategies must address both immediate remediation and long-term architectural improvements. The most effective solution is for Jazzware to release a firmware update that patches this specific flaw by implementing strict file type validation, ensuring only verified upgrade packages are accepted during the upload process. This should include checking file signatures rather than relying solely on extensions, as extension spoofing is trivial. Additionally, uploaded files should be stored in non-executable directories with restricted permissions to prevent direct execution via HTTP requests even if an attacker manages to bypass initial checks. For organizations currently running vulnerable versions, it is critical to restrict access to the web management interface using network segmentation and firewall rules that limit exposure to only authorized administrative IP addresses. Regular audits of user accounts should also be conducted to ensure that credentials are not shared or compromised, reducing the attack surface for authenticated exploits like this one.