CVE-2026-1742
Published: 02 February 2026
Summary
CVE-2026-1742 is a medium-severity Improper Access Control (CWE-284) vulnerability in Iptime A8004T Firmware. Its CVSS base score is 5.1 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Web Shell (T1505.003); ranked at the 26.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 AC-3 (Access Enforcement) and SI-10 (Information Input Validation).
Deeper analysis
CVE-2026-1742 is an unrestricted file upload vulnerability affecting the EFM ipTIME A8004T router running firmware version 14.18.2. The issue resides in the commit_vpncli_file_upload function within the /cgi/timepro.cgi script of the VPN Service component. This flaw, associated with CWE-284 (Improper Access Control) and CWE-434 (Unrestricted Upload of File with Dangerous Type), allows manipulation that bypasses file upload restrictions.
The vulnerability can be exploited remotely over the network with low attack complexity and no user interaction required, but it demands high privileges (PR:H), such as administrative access. Successful exploitation grants limited impact: low confidentiality, integrity, and availability effects (CVSSv3.1 base score of 4.7). Attackers could upload malicious files via the VPN service, potentially leading to further compromise depending on the uploaded content.
Advisories from VulDB indicate that the vendor was contacted early about the disclosure but provided no response, with no patches or mitigations mentioned. References include a public exploit in a GitHub issue and VulDB entries detailing the vulnerability.
Notable context includes a publicly available exploit, increasing the risk of active use against unpatched devices.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-5128
Vulnerability details
A vulnerability was identified in EFM ipTIME A8004T 14.18.2. Affected by this vulnerability is the function commit_vpncli_file_upload of the file /cgi/timepro.cgi of the component VPN Service. Such manipulation leads to unrestricted upload. It is possible to launch the attack remotely.…
more
The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Unrestricted file upload in server-side CGI/VPN component directly enables placement of arbitrary executable content such as web shells for persistence and remote code execution.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly enforces access-control policy on the commit_vpncli_file_upload function so that even an authenticated administrator cannot perform the unrestricted upload that the CVE exploits.
Requires validation of all input to /cgi/timepro.cgi, blocking upload of files whose type or content would violate the allowed set and thereby stopping the CWE-434 vector.
Disables or removes the VPN Service upload capability (or the entire timepro.cgi endpoint) when it is not required, eliminating the attack surface described in the CVE.