CVE-2026-24431: Tenda W30e Information Disclosure Flaw

CVE-2026-24431 Overview

A plaintext password storage vulnerability has been identified in Shenzhen Tenda W30E V2 firmware versions up to and including V16.01.0.19(5037). The administrative web interface displays stored user account passwords in plaintext, allowing any user with access to the affected management pages to directly view credentials. This represents a significant security flaw in credential management that could lead to unauthorized access and lateral movement within networks where these devices are deployed.

Critical Impact

Any authenticated user accessing the administrative interface can view plaintext credentials, potentially compromising all accounts configured on the device and enabling further network intrusion.

Affected Products

• Tenda W30E Firmware versions up to and including V16.01.0.19(5037)
• Tenda W30E Hardware Version 2.0

Discovery Timeline

• 2026-01-26 - CVE-2026-24431 published to NVD
• 2026-01-28 - Last updated in NVD database

Technical Details for CVE-2026-24431

Vulnerability Analysis

This vulnerability stems from improper handling of sensitive credential data within the Tenda W30E router's administrative web interface. The firmware fails to properly mask or encrypt user account passwords when displaying them in the management console, instead rendering them in plaintext. This design flaw violates fundamental security principles regarding credential storage and display.

The exposure occurs within the administrative pages where user account information is managed. When an administrator or any user with sufficient privileges navigates to these configuration pages, the passwords associated with user accounts are displayed without any obfuscation. This creates a direct path for credential theft by any party who gains access to the administrative interface, whether through legitimate means, social engineering, or exploitation of other vulnerabilities.

Root Cause

The root cause of CVE-2026-24431 is classified under CWE-317 (Cleartext Storage of Sensitive Information in GUI). The firmware developers failed to implement proper credential handling mechanisms that would either:

1. Store passwords using secure one-way hashing algorithms
2. Mask password fields in the user interface with placeholder characters
3. Implement access controls that restrict password visibility even to administrators

Instead, the application stores and retrieves passwords in their original plaintext form and displays them directly in the web interface without sanitization.

Attack Vector

The attack vector for this vulnerability is network-based, requiring the attacker to have authenticated access to the administrative web interface. An attacker who has compromised or been granted a low-privilege account on the router's management system can navigate to the user management pages and observe plaintext passwords for all configured accounts, including administrator accounts.

The vulnerability can be exploited through several scenarios:

The attack involves navigating to the administrative interface at the router's management IP address (typically 192.168.0.1 or similar), authenticating with any valid credentials, and accessing the user account management pages where passwords are displayed in plaintext. This allows credential harvesting without any specialized tools or exploit code.

Detection Methods for CVE-2026-24431

Indicators of Compromise

• Unusual access patterns to user management pages in the administrative interface
• Multiple login attempts from previously unseen IP addresses following interface access
• Unauthorized configuration changes or new administrative accounts being created
• Evidence of credential reuse attacks on other network systems using harvested credentials

Detection Strategies

• Monitor HTTP/HTTPS traffic to the Tenda W30E administrative interface for excessive requests to user management endpoints
• Implement network segmentation to isolate management interfaces and log all access attempts
• Deploy SentinelOne agents on systems that interact with network infrastructure to detect post-exploitation activity
• Review access logs for the router's administrative interface for anomalous user behavior

Monitoring Recommendations

• Enable verbose logging on all network infrastructure devices including the Tenda W30E
• Implement SIEM correlation rules to alert on multiple sequential accesses to administrative pages
• Configure network monitoring to detect credential stuffing attempts that may follow password harvesting
• Establish baseline user behavior patterns and alert on deviations

How to Mitigate CVE-2026-24431

Immediate Actions Required

• Restrict access to the Tenda W30E administrative interface to trusted IP addresses only using firewall rules
• Change all user account passwords on the affected device and ensure those credentials are not reused elsewhere
• Implement network segmentation to isolate the management interface from general network traffic
• Consider replacing affected devices with alternatives that implement secure credential handling

Patch Information

At the time of publication, no vendor patch has been released to address this vulnerability. Organizations should consult the Tenda W30E Product Page for firmware updates and monitor the VulnCheck Advisory for additional security guidance.

Workarounds

• Implement strict access controls limiting administrative interface access to specific management workstations
• Use a VPN or out-of-band management network for all router administration activities
• Disable remote management features if not required for operations
• Implement multi-factor authentication at the network level before allowing access to the management interface

# Example firewall rule to restrict administrative access
# Allow only specific management IP to access web interface
iptables -A INPUT -p tcp --dport 80 -s 10.0.0.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -s 10.0.0.100 -j ACCEPT
iptables -A INPUT -p tcp --dport 80 -j DROP
iptables -A INPUT -p tcp --dport 443 -j DROP