CVE-2026-0408 is a vulnerability identified in the NETGEAR EX5000 WiFi range extender, classified under CWE-287 for improper authentication. The flaw is a path traversal vulnerability that allows an attacker who has already authenticated on the local area network (LAN) to access sensitive files not intended for exposure. Specifically, the attacker can retrieve the contents of a dynamically generated file named webproc, which logs the usernames and passwords submitted through the device's web-based GUI. This exposure of credentials can lead to unauthorized access to the device and potentially the broader network. The vulnerability does not require user interaction but does require the attacker to have some level of authenticated access on the LAN, which limits remote exploitation but still poses a serious risk in internal network scenarios. The CVSS 4.0 score is 6.1 (medium severity), reflecting the moderate complexity of exploitation and the high impact on confidentiality, integrity, and availability if exploited. No patches or known exploits have been reported at the time of publication, but the vulnerability is publicly disclosed and should be addressed proactively. The issue highlights a failure in proper authentication and access control mechanisms within the device's firmware, allowing traversal to sensitive files that should be protected.

For European organizations, the impact of CVE-2026-0408 can be significant, especially in environments where NETGEAR EX5000 extenders are deployed to extend WiFi coverage. Exposure of administrative credentials can lead to unauthorized device configuration changes, network reconnaissance, and lateral movement within the network. This can compromise the confidentiality of sensitive data and the integrity of network operations. Given the vulnerability requires LAN authentication, insider threats or attackers who have gained initial footholds inside the network are the primary risk actors. The potential for credential leakage can facilitate further attacks such as privilege escalation or persistent access. Organizations in sectors with strict data protection regulations (e.g., GDPR) may face compliance risks if such a breach leads to data exposure. Additionally, the disruption of network availability through device misconfiguration could impact business continuity. The medium severity rating suggests that while the vulnerability is not trivially exploitable remotely, the consequences of exploitation within the network are serious enough to warrant immediate attention.

1. Immediately audit and restrict LAN access to trusted users and devices to reduce the risk of an attacker gaining authenticated access. 2. Change default and known passwords on all NETGEAR EX5000 devices to strong, unique credentials to limit the effectiveness of credential exposure. 3. Monitor network traffic and device logs for unusual access patterns or attempts to access the webproc file or other sensitive resources. 4. Segment the network to isolate WiFi extenders from critical infrastructure and sensitive data environments, minimizing lateral movement opportunities. 5. Regularly update device firmware and check NETGEAR’s official channels for patches or security advisories addressing this vulnerability. 6. If possible, disable remote management features and restrict management interfaces to specific IP addresses or VLANs. 7. Employ network intrusion detection systems (NIDS) to detect exploitation attempts related to path traversal or unauthorized file access. 8. Conduct security awareness training for staff to recognize and report suspicious network activity that could indicate exploitation attempts. 9. Consider replacing affected devices with models that have stronger security postures if patches are not forthcoming.