CVE-2026-108907 Overview
CVE-2026-108907 is an authentication bypass vulnerability [CWE-287] in the Netcore NR268 router running firmware version 1.7.121109. The flaw resides in the user_ok function of the CGI Execution component, served by the embedded Boa web server. Attackers can exploit the weakness remotely over the network without credentials or user interaction. The exploit has been publicly disclosed, and the vendor did not respond to disclosure attempts, leaving affected devices without an official fix.
Critical Impact
Remote, unauthenticated attackers can bypass authentication on the router's web management interface, gaining control over device configuration, routing, and network traffic.
Affected Products
- Netcore NR268 router
- Firmware version 1.7.121109
- Boa web server CGI handler (user_ok function)
Discovery Timeline
- 2026-10-12 - CVE-2026-108907 published to NVD
- 2026-10-13 - Last updated in NVD database
Technical Details for CVE-2026-108907
Vulnerability Analysis
The Netcore NR268 exposes a web administration interface powered by the Boa HTTP server. The user_ok function is responsible for validating whether an incoming CGI request belongs to an authenticated session. Due to flawed logic in this function, the authentication check can be satisfied by requests that should otherwise be rejected. Attackers reaching the device's HTTP interface can invoke privileged CGI endpoints as if they were already logged in. Because the router sits at the network edge, successful exploitation yields control over DNS settings, firewall rules, port forwarding, and client traffic inspection.
Root Cause
The root cause is improper authentication logic [CWE-287] within the user_ok function of the Boa CGI handler. The function fails to correctly enforce session state or credential verification before granting access to protected CGI resources. Public technical analysis is available in the GitHub Report on Boa Auth Fail and the VulDB CVE-2026-108907 Entry.
Attack Vector
Exploitation requires only network reachability to the router's HTTP management port. The attacker sends a crafted HTTP request to a protected CGI endpoint. The user_ok check returns a successful result despite the absence of valid credentials. The attacker then issues subsequent CGI calls to read configuration, modify settings, or persist control. No prior authentication, user interaction, or elevated privileges are required.
See the published proof-of-concept details in the GitHub Report on Boa Auth Fail for the specific request pattern.
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Stop Identity AttacksDetection Methods for CVE-2026-108907
Indicators of Compromise
- Unexpected HTTP requests to CGI endpoints on the router's management interface originating from external or unusual internal addresses.
- Configuration changes to DNS servers, administrative passwords, or port-forwarding rules that were not performed by authorized administrators.
- New or modified firewall and routing rules appearing in device logs without a corresponding admin login event.
Detection Strategies
- Inspect router access logs for CGI invocations that succeed without a preceding successful login event.
- Baseline the router's HTTP management interface and alert on access attempts from WAN-side sources.
- Correlate device configuration changes with authenticated session records to identify silent configuration drift.
Monitoring Recommendations
- Forward router syslog and HTTP access logs to a centralized logging platform for retention and analysis.
- Monitor outbound DNS traffic from clients behind affected routers for redirection to untrusted resolvers.
- Track administrative interface exposure by scheduling external scans for open management ports on edge devices.
How to Mitigate CVE-2026-108907
Immediate Actions Required
- Restrict access to the router's web management interface to trusted internal management VLANs only.
- Disable WAN-side administration on the Netcore NR268 to eliminate remote exposure of the vulnerable CGI endpoint.
- Replace affected Netcore NR268 devices in high-risk environments with a supported router from a vendor that provides security maintenance.
- Rotate credentials for any accounts or services that may have transited the router since exploitation would allow traffic interception.
Patch Information
No vendor patch is available. According to the disclosure record on the VulDB CVE-2026-108907 Entry, the vendor was contacted but did not respond. Organizations should treat the device as unsupported for the purpose of this vulnerability and plan replacement or compensating network controls.
Workarounds
- Place the router behind an upstream firewall that blocks inbound connections to the HTTP management port.
- Enforce ACLs on the management interface to permit only specific administrator source IP addresses.
- Segment the network so that compromise of the router does not expose sensitive internal services or identity systems.
- Monitor for anomalous CGI access patterns and alert on configuration changes that occur outside maintenance windows.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
