CVE-2026-0408 is a vulnerability classified under CWE-287 (Improper Authentication) found in the NETGEAR EX5000 WiFi range extender. The flaw is a path traversal vulnerability that allows an attacker who already has LAN-level authentication to access the router’s internal IP and retrieve the contents of a dynamically generated file named webproc. This file logs usernames and passwords submitted through the router’s graphical user interface (GUI). The vulnerability arises because the device does not properly restrict access to this sensitive file, enabling an authenticated local attacker to escalate their access by harvesting credentials stored in the webproc file. The CVSS 4.0 score is 6.1 (medium severity), reflecting that the attack vector is local (adjacent network), requires low attack complexity, and privileges at the LAN authentication level, but does not require user interaction. The impact on confidentiality, integrity, and availability is high due to the exposure of sensitive credentials. No patches or exploits are currently documented, but the vulnerability poses a significant risk to network security if exploited. The issue was reserved in December 2025 and published in January 2026, indicating recent discovery and disclosure.

For European organizations, this vulnerability could lead to unauthorized disclosure of router administrative credentials, enabling attackers to gain control over the affected WiFi range extenders. This can compromise network integrity and confidentiality, potentially allowing lateral movement within corporate networks or home environments. Given the role of WiFi extenders in extending network coverage, attackers could leverage this access to intercept or manipulate network traffic, disrupt connectivity, or pivot to other critical infrastructure. The impact is particularly significant for organizations relying on NETGEAR EX5000 devices in sensitive environments or where network segmentation is weak. Additionally, exposure of credentials could facilitate further attacks such as firmware tampering or persistent backdoors. The medium severity rating suggests a moderate but non-trivial risk that warrants timely mitigation.

1. Immediately restrict LAN access to trusted users and devices to minimize the risk of an attacker gaining the required authentication level. 2. Monitor network traffic for unusual access patterns to the router’s internal IP or attempts to access the webproc file. 3. Apply any available firmware updates from NETGEAR as soon as they are released addressing this vulnerability. 4. If patches are not yet available, consider isolating the EX5000 devices on segmented networks with strict access controls. 5. Change default and administrative passwords regularly and enforce strong password policies to reduce the risk of credential compromise. 6. Disable remote management features if not required to reduce attack surface. 7. Conduct regular security audits of network devices, including WiFi extenders, to detect unauthorized access or configuration changes. 8. Educate users about the risks of LAN authentication and the importance of network security hygiene.