CVE-2026-1505 is an OS command injection vulnerability identified in the D-Link DIR-615 router firmware version 4.10. The vulnerability resides in the URL Filter component, specifically in the /set_temp_nodes.php endpoint, where improper input validation allows attackers to inject arbitrary operating system commands. This flaw can be exploited remotely without requiring user interaction or authentication, making it highly accessible to attackers. The vulnerability has a CVSS 4.0 base score of 8.6, indicating high severity due to its network attack vector, low complexity, and the potential for complete compromise of the device. Exploiting this vulnerability could allow attackers to execute arbitrary commands with high privileges, potentially leading to device takeover, interception or manipulation of network traffic, and pivoting into internal networks. Although the product is no longer supported and no official patches are available, public exploit code has been released, increasing the likelihood of exploitation. The lack of vendor support means organizations must rely on alternative mitigation strategies such as network-level protections or device replacement. This vulnerability highlights the risks associated with legacy network equipment still in operation.

For European organizations, the impact of CVE-2026-1505 can be significant, especially for those still using the D-Link DIR-615 routers in their network infrastructure. Successful exploitation can lead to full device compromise, allowing attackers to intercept sensitive data, disrupt network availability, or use the device as a foothold for further attacks within the internal network. This is particularly critical for organizations in sectors such as government, finance, healthcare, and critical infrastructure where network security is paramount. The vulnerability's remote exploitability without authentication increases the risk of widespread attacks, especially if these devices are exposed to the internet or poorly segmented internal networks. Additionally, since the device is no longer supported, organizations cannot rely on vendor patches, increasing the operational risk and potential compliance issues under European data protection regulations like GDPR. The presence of public exploits further elevates the threat landscape, making timely mitigation essential to prevent potential breaches.

Given the absence of official patches for this unsupported product, European organizations should prioritize the following mitigation strategies: 1) Immediate replacement of D-Link DIR-615 devices with supported, security-updated hardware to eliminate the vulnerability. 2) If replacement is not immediately feasible, isolate affected routers from direct internet exposure by implementing strict firewall rules and network segmentation to limit access to the vulnerable /set_temp_nodes.php endpoint. 3) Employ network intrusion detection and prevention systems (IDS/IPS) configured to detect and block known exploit patterns targeting this vulnerability. 4) Regularly audit network devices to identify legacy hardware and assess exposure risk. 5) Restrict administrative access to the device to trusted internal networks only, using VPNs or secure management channels. 6) Monitor network traffic for unusual command execution attempts or anomalies indicative of exploitation. 7) Educate IT staff about the risks of unsupported devices and the importance of timely hardware lifecycle management. These targeted measures go beyond generic advice by focusing on compensating controls and proactive device management in the absence of vendor patches.