CVE-2026-18810 Overview
CVE-2026-18810 is a missing authentication vulnerability [CWE-287] affecting the H3C NX15 router running firmware version V100R017. The flaw resides in an unspecified function of the /api/wizard/networkSetup endpoint. Remote attackers can reach this endpoint without providing credentials, enabling pre-authentication interaction with the device wizard interface. Public proof-of-concept material has been published in a third-party research repository. The vendor was contacted before public disclosure.
Critical Impact
Remote unauthenticated attackers can invoke the networkSetup wizard API on affected H3C NX15 devices, impacting confidentiality, integrity, and availability of network configuration data.
Affected Products
- H3C NX15 router, firmware version V100R017
- /api/wizard/networkSetup API endpoint on the affected firmware
- Deployments exposing the device management interface to untrusted networks
Discovery Timeline
- 2026-08-04 - CVE-2026-18810 published to the National Vulnerability Database
- 2026-08-05 - Last updated in NVD database
Technical Details for CVE-2026-18810
Vulnerability Analysis
The H3C NX15 exposes a setup wizard API at /api/wizard/networkSetup intended for initial device provisioning. The endpoint fails to enforce authentication checks before processing requests. An attacker with network reachability to the device can invoke wizard functionality without providing valid session credentials or administrative tokens.
The vulnerability is classified under [CWE-287] Improper Authentication. Wizard endpoints in embedded router firmware often accept configuration parameters that alter network behavior, meaning missing authentication on such an endpoint permits pre-authentication access to sensitive functionality. The published research references indicate the endpoint can be reached in a pre-authentication hijack scenario.
Root Cause
The root cause is the absence of an authentication guard on the wizard route handler. Wizard interfaces in router firmware are typically intended for first-boot setup and often bypass session enforcement to simplify onboarding. When the same route remains reachable after commissioning, any client that can send HTTP requests to the device management interface can trigger the underlying handler.
Attack Vector
Exploitation requires only network access to the device management interface. No user interaction, credentials, or privileges are required. Attackers can send crafted HTTP requests directly to /api/wizard/networkSetup from any host that can reach the router's management plane. Devices with management interfaces exposed to the internet or to untrusted network segments face the highest exposure.
No verified exploitation code is reproduced here. Technical details and a proof-of-concept are referenced in the GitHub PoC Repository and the VulDB CVE-2026-18810 entry.
Detection Methods for CVE-2026-18810
Indicators of Compromise
- HTTP requests to /api/wizard/networkSetup originating from sources outside expected administrative subnets
- Unexpected changes to network configuration parameters (WAN settings, DNS, routing) on H3C NX15 devices
- Repeated probing of /api/wizard/ paths in device or upstream proxy logs
Detection Strategies
- Inspect web server and management-plane logs on H3C NX15 devices for accesses to /api/wizard/networkSetup that lack a corresponding authenticated administrator session
- Deploy network IDS signatures that flag HTTP requests to wizard endpoints on router management ports from non-administrative source addresses
- Correlate configuration change events with the source IP of the initiating request to identify unauthenticated modifications
Monitoring Recommendations
- Alert on any inbound traffic to router management interfaces from WAN or untrusted VLAN segments
- Monitor for anomalous DNS, routing, or WAN configuration drift on H3C NX15 devices
- Ingest device syslog into a centralized SIEM and baseline expected wizard endpoint usage during commissioning windows only
How to Mitigate CVE-2026-18810
Immediate Actions Required
- Restrict access to the H3C NX15 management interface to trusted administrative networks using ACLs or firewall rules
- Disable remote WAN-side management on affected devices until a vendor patch is applied
- Audit device configuration for unauthorized changes by comparing against a known-good baseline
Patch Information
At the time of publication, no vendor advisory or fixed firmware version has been published in the NVD entry for CVE-2026-18810. Administrators should monitor the VulDB Vulnerability #385809 entry and H3C security bulletins for firmware updates addressing the missing authentication check on /api/wizard/networkSetup.
Workarounds
- Block external access to router HTTP/HTTPS management ports at the network perimeter
- Place H3C NX15 devices behind a management VLAN reachable only via jump hosts requiring multi-factor authentication
- Where supported by device configuration, disable the setup wizard interface after initial provisioning
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
