CVE-2026-1740 identifies a security weakness in the EFM ipTIME A8004T router firmware version 14.18.2, specifically within the httpcon_check_session_url function of the /cgi/timepro.cgi script, which is part of a hidden login setup interface. The vulnerability arises from improper authentication logic that fails to adequately verify session credentials, allowing an attacker to bypass authentication mechanisms remotely without any privileges or user interaction. This means an attacker can send crafted HTTP requests to the affected CGI endpoint and gain unauthorized access to the router's administrative functions or sensitive configuration interfaces. The flaw is significant because it compromises the fundamental security boundary of the device, potentially enabling attackers to manipulate network settings, intercept traffic, or pivot into internal networks. The vulnerability has a CVSS 4.0 score of 6.9, reflecting moderate impact on confidentiality, integrity, and availability, with ease of exploitation due to no required authentication or user interaction. The vendor was contacted but has not issued a patch or mitigation guidance, increasing the risk for users. While no widespread exploitation has been reported, public exploit code availability raises the likelihood of future attacks.

The improper authentication vulnerability in the ipTIME A8004T router can lead to unauthorized administrative access, allowing attackers to alter device configurations, disable security features, or intercept and manipulate network traffic. This can compromise the confidentiality and integrity of data traversing the network and potentially disrupt availability if the device is misconfigured or disabled. Organizations relying on this router model, especially in small to medium business or home environments, face risks of network compromise, lateral movement, and data exfiltration. The lack of vendor response and patch availability prolongs exposure, increasing the window for attackers to exploit the vulnerability. Given the router’s role as a network gateway, successful exploitation could impact entire organizational networks, leading to operational disruptions and potential regulatory compliance issues related to data protection.

Since no official patch or vendor guidance is available, affected organizations should implement compensating controls immediately. These include isolating the vulnerable router from untrusted networks by restricting remote management access via firewall rules or VPNs, disabling remote administration features if possible, and monitoring network traffic for suspicious activity targeting the /cgi/timepro.cgi endpoint. Network segmentation should be enforced to limit the impact of a compromised device. Organizations should consider replacing the affected router with a different model or vendor that provides timely security updates. Additionally, applying strict access control lists (ACLs) to management interfaces and conducting regular firmware integrity checks can help detect exploitation attempts. Finally, organizations should maintain heightened vigilance for indicators of compromise and prepare incident response plans in case of exploitation.