CVE-2026-24435
📋 TL;DR
This CVE describes an insecure CORS policy in Tenda W30E V2 routers that allows attacker-controlled websites to make authenticated cross-origin requests to the router's administrative interface. Attackers can potentially steal sensitive configuration data or perform unauthorized administrative actions. All users of affected firmware versions are vulnerable.
💻 Affected Systems
- Tenda W30E V2 router
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to change DNS settings, capture network traffic, install backdoors, or disable security features.
Likely Case
Theft of router credentials and configuration data, potentially leading to network reconnaissance and credential reuse attacks.
If Mitigated
Limited to same-origin requests only, preventing cross-site attacks while maintaining legitimate administrative access.
🎯 Exploit Status
Exploitation requires user to visit malicious website while authenticated to router admin interface. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: Yes
Instructions:
1. Check Tenda website for firmware updates
2. Download latest firmware for W30E V2
3. Log into router admin interface
4. Navigate to System Tools > Firmware Upgrade
5. Upload and install new firmware
6. Reboot router
🔧 Temporary Workarounds
Network Segmentation
allIsolate router management interface from user networks
Browser Security Extensions
allUse browser extensions that block cross-origin requests to local network addresses
🧯 If You Can't Patch
- Disable remote administration and only access router admin interface from dedicated management computer
- Implement strict browser security policies preventing access to router IP from general web browsing
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin interface under System Status > Firmware VersionCheck Version:
curl -I http://router-ip/ | grep ServerVerify Fix Applied:
Verify firmware version is newer than V16.01.0.19(5037) and test CORS headers on admin endpoints📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts from unusual origins
- Configuration changes from non-local IPs
Network Indicators:
- HTTP requests to router admin endpoints with Origin headers from external domains
- CORS preflight requests to router
SIEM Query:
http.url:"/cgi-bin/*" AND http.headers.origin:* AND NOT http.headers.origin:"http://router-ip"