CVE-2026-79588: U-speed WIFI4 N300 Credential Exposure Flaw

CVE-2026-79588 Overview

CVE-2026-79588 affects the U-speed WIFI4 N300 T1 Pro v1.0.0 wireless router. The device transmits administrative credentials in cleartext over HTTP during the login process. An attacker on the adjacent network can capture these credentials by passively monitoring wireless traffic. The vulnerability is classified under [CWE-319] Cleartext Transmission of Sensitive Information.

Critical Impact
Administrative credentials sent in cleartext expose router management functions to any attacker within wireless range who can observe network traffic.

Affected Products

U-speed WIFI4 N300 T1 Pro v1.0.0

Discovery Timeline

2026-09-08 - CVE-2026-79588 published to NVD
2026-09-09 - Last updated in NVD database

Technical Details for CVE-2026-79588

Vulnerability Analysis

The U-speed WIFI4 N300 T1 Pro v1.0.0 router exposes its web-based administrative interface over unencrypted HTTP. Credentials submitted through the login form travel in plaintext across the local network segment. Any device sharing the wireless network or wired LAN can capture the authentication data using standard packet capture tools.

The attack requires adjacent network access, meaning the attacker must be within the same broadcast domain. Once credentials are obtained, the attacker gains full administrative control of the router. This includes DNS reconfiguration, firmware modification, and traffic redirection.

Root Cause

The root cause is the absence of Transport Layer Security (TLS) on the management interface. The device does not implement HTTPS or any alternative encrypted channel for administrative authentication. This design choice violates baseline confidentiality requirements for network infrastructure devices.

Attack Vector

An attacker on the same network segment runs a packet capture utility such as tcpdump or Wireshark. When an administrator logs into the router, the HTTP POST request containing the username and password is captured in cleartext. The attacker then reuses these credentials to authenticate to the management interface. See the GitHub CVE-2026-79588 Disclosures for technical details.

Detection Methods for CVE-2026-79588

Indicators of Compromise

Unexpected administrative login events from unrecognized IP addresses on the local network.
Configuration changes to DNS servers, port forwarding, or firmware without authorized administrator action.
Presence of promiscuous-mode network interfaces on client devices connected to the router.

Detection Strategies

Monitor router logs for administrative access from unexpected client addresses.
Inspect network traffic for HTTP POST requests directed at the router management IP containing authentication fields.
Baseline the router configuration and alert on unauthorized changes to DNS, firewall, or firmware settings.

Monitoring Recommendations

Deploy network intrusion detection on the LAN to flag cleartext credential submissions.
Track wireless client associations and correlate them with administrative session activity.
Review router audit logs on a recurring schedule for anomalous login sources or times.

How to Mitigate CVE-2026-79588

Immediate Actions Required

Restrict administrative access to the router to a wired management port or trusted VLAN.
Change the router administrator password after any suspected exposure and rotate it regularly.
Isolate the router management interface from general-purpose wireless clients.

Patch Information

No vendor patch is referenced in the NVD entry for CVE-2026-79588. Consult the GitHub CVE-2026-79588 Disclosures for the researcher's advisory and check the vendor's website for firmware updates.

Workarounds

Access the management interface only from a directly connected wired host to avoid wireless exposure.
Segment the router management subnet from user devices using VLANs or a dedicated administrative network.
Disable remote management features and restrict administration to a minimal set of trusted MAC addresses where supported.

bash

# Example: restrict router management to a wired admin host
# Replace 192.0.2.10 with the administrator workstation address
iptables -A INPUT -p tcp --dport 80 -s 192.0.2.10 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP