CVE-2026-24439
📋 TL;DR
Tenda W30E V2 routers with vulnerable firmware lack the X-Content-Type-Options: nosniff header on web management interfaces. This allows attackers to trick browsers into executing malicious scripts via MIME sniffing. All users with affected firmware versions are vulnerable.
💻 Affected Systems
- Shenzhen Tenda W30E V2
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could execute arbitrary JavaScript in the router's web management interface, potentially leading to credential theft, configuration changes, or router compromise.
Likely Case
Attackers could perform cross-site scripting attacks against authenticated users, stealing session cookies or performing actions on their behalf.
If Mitigated
With proper network segmentation and access controls, impact is limited to the management interface only.
🎯 Exploit Status
Exploitation requires user to visit attacker-controlled content while authenticated to the router's web interface.
🛠️ 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. 3. Log into router web interface. 4. Navigate to System Tools > Firmware Upgrade. 5. Upload and install new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Add X-Content-Type-Options header via reverse proxy
allPlace router behind reverse proxy that adds X-Content-Type-Options: nosniff header to all responses
nginx: add_header X-Content-Type-Options nosniff always;
Apache: Header always set X-Content-Type-Options nosniff
🧯 If You Can't Patch
- Restrict access to router management interface to trusted IP addresses only
- Use separate browser/incognito mode for router administration and avoid browsing other sites
🔍 How to Verify
Check if Vulnerable:
1. Access router web interface. 2. Open browser developer tools (F12). 3. Go to Network tab. 4. Refresh page. 5. Check response headers for X-Content-Type-Options header.Check Version:
Log into router web interface and check System Status or About pageVerify Fix Applied:
Verify X-Content-Type-Options: nosniff header appears in all web interface responses📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts
- Unusual configuration changes
Network Indicators:
- HTTP requests to router with suspicious query parameters
- Traffic to router from unexpected sources
SIEM Query:
source_ip=router_ip AND (http_user_agent CONTAINS 'script' OR http_referer CONTAINS suspicious_domain)