CVE-2026-1505 is an OS command injection vulnerability identified in the D-Link DIR-615 router firmware version 4.10. The flaw exists in the URL Filter component, specifically in the /set_temp_nodes.php endpoint, where insufficient input validation allows an attacker to inject arbitrary operating system commands. This vulnerability can be exploited remotely without user interaction, but it requires the attacker to have high privileges on the device, such as administrative access to the router’s management interface. The vulnerability has a CVSS 4.0 base score of 8.6, indicating high severity, with a vector showing network attack vector, low attack complexity, no privileges required for attack (though the CVSS vector states PR:H, which suggests high privileges are needed, indicating some ambiguity), and no user interaction. The impact covers confidentiality, integrity, and availability, as arbitrary command execution can lead to full device compromise, data leakage, or denial of service. The affected product, D-Link DIR-615 version 4.10, is no longer supported by the vendor, meaning no official patches are available. While no confirmed exploits are reported in the wild, proof-of-concept exploits have been made public, increasing the risk of active exploitation. The vulnerability is particularly dangerous because routers are critical network infrastructure devices, and compromise can lead to broader network infiltration or disruption.

The impact of CVE-2026-1505 is significant for organizations still operating the vulnerable D-Link DIR-615 routers with firmware version 4.10. Successful exploitation allows remote attackers to execute arbitrary OS commands, potentially leading to full device compromise. This can result in unauthorized access to network traffic, interception or manipulation of data, disruption of network services, and pivoting to internal networks for further attacks. Since routers serve as gateways, their compromise can undermine the security of entire organizational networks. The lack of vendor support and patches exacerbates the risk, as vulnerable devices remain exposed indefinitely. Organizations with exposed management interfaces or weak network segmentation are particularly vulnerable. The threat is amplified in environments where these routers are deployed in critical infrastructure, small to medium enterprises, or home networks that rely on these devices for connectivity and security.

Given the absence of official patches due to discontinued support, organizations should prioritize replacing the affected D-Link DIR-615 devices with newer, supported models that receive regular security updates. Until replacement is feasible, network administrators should restrict access to the router’s management interface by limiting it to trusted internal networks and disabling remote management features. Implement strict network segmentation to isolate vulnerable devices from critical systems and sensitive data. Employ network monitoring and intrusion detection systems to identify unusual command execution or traffic patterns indicative of exploitation attempts. Regularly audit device firmware versions and configurations to ensure no unauthorized changes occur. Additionally, consider deploying firewall rules to block access to the vulnerable /set_temp_nodes.php endpoint if possible. Educate users and administrators about the risks of using unsupported hardware and the importance of timely upgrades.