CVE-2026-18590 in WL-NU516U1
Summary
by MITRE • 08/03/2026
A vulnerability was determined in Wavlink WL-NU516U1 708c073-mt7628. Affected is the function set_sys_adm of the file adm.cgi of the component Admin Password Handler. This manipulation causes os command injection. The attack is possible to be carried out remotely. The exploit has been publicly disclosed and may be utilized. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
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Analysis
by VulDB Data Team • 08/03/2026
The Wavlink WL-NU516U1 708c073-mt7628 device presents a critical command injection vulnerability within its administrative interface that stems from improper input validation in the set_sys_adm function of the adm.cgi component. This flaw exists within the Admin Password Handler module and represents a severe security weakness that allows remote attackers to execute arbitrary operating system commands on the affected device. The vulnerability specifically manifests through manipulation of the administrative password handling functionality, where insufficient sanitization of user-supplied input enables attackers to inject malicious commands that are subsequently executed by the underlying operating system.
The technical exploitation of this vulnerability occurs through a remote attack vector that does not require authentication, making it particularly dangerous as it can be leveraged by anyone with network access to the device. The flaw operates at the application layer and directly impacts the device's operating system, allowing attackers to gain unauthorized control over system processes and potentially escalate their privileges within the device's environment. This type of vulnerability falls under the Common Weakness Enumeration category CWE-78, which specifically addresses Operating System Command Injection, a well-documented weakness that has been consistently exploited across various networked devices and applications.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with complete control over the device's functionality and potentially exposes sensitive data or creates entry points for further network penetration attempts. Attackers could exploit this vulnerability to modify system configurations, install malicious software, or use the device as a pivot point for attacking other systems within the same network. The fact that the exploit has been publicly disclosed significantly increases the risk profile of affected devices, as it removes the element of surprise that typically protects against such attacks and makes it accessible to threat actors with minimal technical expertise.
Security professionals should immediately implement mitigation strategies including upgrading to the vendor-provided patched firmware version, which demonstrates the vendor's commitment to addressing security concerns through professional response protocols. Additionally, network segmentation and access controls should be implemented to limit exposure of the affected device to only authorized users and systems. The quick response from the vendor in releasing a fixed version indicates proper vulnerability disclosure practices and highlights the importance of maintaining current firmware versions for networked devices. Organizations should also consider implementing network monitoring solutions to detect potential exploitation attempts and establish regular security assessments to identify similar vulnerabilities in other network equipment components. This vulnerability serves as a reminder of the critical need for secure software development practices and proper input validation in embedded systems that handle administrative functions, particularly those with remote access capabilities.