CVE-2026-20748
📋 TL;DR
This WebSocket vulnerability allows session hijacking by connecting with predictable charging station identifiers, enabling attackers to impersonate legitimate stations or cause denial-of-service. It affects systems using vulnerable WebSocket backend implementations for charging station management.
💻 Affected Systems
- WebSocket backend implementations for charging station management
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Malicious actors could take control of charging stations, issue unauthorized commands, disrupt charging operations, or manipulate billing data.
Likely Case
Session hijacking leading to unauthorized access to charging station management functions and potential service disruption.
If Mitigated
Limited impact with proper session management and network segmentation in place.
🎯 Exploit Status
Exploitation requires understanding of session identifier patterns but no authentication needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified
Vendor Advisory: https://www.cisa.gov/news-events/ics-advisories/icsa-26-062-08
Restart Required: Yes
Instructions:
1. Review vendor advisory for specific patches. 2. Apply security updates if available. 3. Restart WebSocket backend services. 4. Validate session management fixes.
🔧 Temporary Workarounds
Implement Session Validation
allAdd server-side validation to ensure only one active session per identifier
# Modify WebSocket backend to track active sessions and reject duplicates
Network Segmentation
linuxRestrict WebSocket access to authorized networks only
# Configure firewall rules to limit WebSocket port access
# Example: iptables -A INPUT -p tcp --dport [websocket_port] -s [trusted_network] -j ACCEPT
🧯 If You Can't Patch
- Implement network-level access controls to restrict WebSocket connections
- Deploy Web Application Firewall (WAF) with session hijacking protection rules
🔍 How to Verify
Check if Vulnerable:
Test if multiple WebSocket connections can be established using the same session identifierCheck Version:
# Check WebSocket backend version: grep -i version /path/to/websocket/configVerify Fix Applied:
Verify that duplicate session connections are rejected and session identifiers are properly randomized📡 Detection & Monitoring
Log Indicators:
- Multiple connection attempts with same session ID
- Session ID collisions in logs
- Unexpected session termination events
Network Indicators:
- Multiple WebSocket connections from different IPs using same identifiers
- High volume of WebSocket handshake requests
SIEM Query:
source="websocket.log" AND ("duplicate session" OR "session collision" OR "multiple connections same id")