CVE-2026-20781
CVE-2026-20781
Weakness (CWE)
CVSS Vector
v4.0- Attack Vector
- Network
- Attack Complexity
- Low
- Attack Requirements
- None
- Privileges Required
- None
- User Interaction
- None
- Confidentiality (Vulnerable)
- High
- Integrity (Vulnerable)
- High
- Availability (Vulnerable)
- Low
- Confidentiality (Subsequent)
- None
- Integrity (Subsequent)
- None
- Availability (Subsequent)
- None
Description
WebSocket endpoints lack proper authentication mechanisms, enabling attackers to perform unauthorized station impersonation and manipulate data sent to the backend. An unauthenticated attacker can connect to the OCPP WebSocket endpoint using a known or discovered charging station identifier, then issue or receive OCPP commands as a legitimate charger. Given that no authentication is required, this can lead to privilege escalation, unauthorized control of charging infrastructure, and corruption of charging network data reported to the backend.
Comprehensive Technical Analysis of CVE-2026-20781
1. Vulnerability Assessment and Severity Evaluation
CVE ID: CVE-2026-20781
Description: The vulnerability pertains to WebSocket endpoints that lack proper authentication mechanisms. This flaw allows attackers to impersonate charging stations and manipulate data sent to the backend. An unauthenticated attacker can connect to the OCPP (Open Charge Point Protocol) WebSocket endpoint using a known or discovered charging station identifier, thereby issuing or receiving OCPP commands as a legitimate charger.
CVSS Score: 9.4
Severity Evaluation:
- Critical: The CVSS score of 9.4 indicates a critical vulnerability. The lack of authentication mechanisms can lead to severe consequences, including privilege escalation, unauthorized control of charging infrastructure, and corruption of charging network data.
2. Potential Attack Vectors and Exploitation Methods
Attack Vectors:
- Unauthenticated Access: An attacker can connect to the WebSocket endpoint without any authentication, using a known or discovered charging station identifier.
- Impersonation: The attacker can impersonate a legitimate charging station by issuing or receiving OCPP commands.
- Data Manipulation: The attacker can manipulate data sent to the backend, leading to corruption of charging network data.
Exploitation Methods:
- Network Scanning: Attackers can scan for open WebSocket endpoints and attempt to connect using known charging station identifiers.
- Command Injection: Once connected, attackers can inject malicious OCPP commands to control the charging infrastructure.
- Data Interception: Attackers can intercept and manipulate data sent to the backend, leading to data corruption and potential financial losses.
3. Affected Systems and Software Versions
Affected Systems:
- Charging stations and backend systems that use the OCPP protocol and WebSocket endpoints for communication.
Software Versions:
- Specific versions of the software implementing the OCPP protocol that lack proper authentication mechanisms for WebSocket endpoints.
4. Recommended Mitigation Strategies
- Implement Authentication: Ensure that WebSocket endpoints require proper authentication mechanisms, such as token-based authentication or certificate-based authentication.
- Access Control: Implement strict access control policies to restrict unauthorized access to WebSocket endpoints.
- Monitoring and Logging: Enable comprehensive monitoring and logging of WebSocket connections to detect and respond to unauthorized access attempts.
- Regular Updates: Keep the software and firmware of charging stations and backend systems up to date with the latest security patches.
- Network Segmentation: Segment the network to isolate charging infrastructure from other critical systems, reducing the attack surface.
5. Impact on Cybersecurity Landscape
Immediate Impact:
- Operational Disruption: Unauthorized control of charging infrastructure can lead to operational disruptions and potential safety risks.
- Data Integrity: Corruption of charging network data can result in financial losses and inaccurate billing.
Long-Term Impact:
- Reputation Damage: Compromised charging infrastructure can lead to loss of trust among users and stakeholders.
- Regulatory Compliance: Failure to address such vulnerabilities can result in non-compliance with regulatory requirements, leading to legal consequences.
6. Technical Details for Security Professionals
Detection:
- Network Traffic Analysis: Use network traffic analysis tools to detect unauthorized WebSocket connections and anomalous OCPP commands.
- Intrusion Detection Systems (IDS): Deploy IDS to monitor for suspicious activities related to WebSocket endpoints.
Response:
- Incident Response Plan: Develop and implement an incident response plan specific to unauthorized access and data manipulation in charging infrastructure.
- Forensic Analysis: Conduct forensic analysis to identify the source of unauthorized access and the extent of data manipulation.
Prevention:
- Security Audits: Regularly conduct security audits of charging infrastructure to identify and mitigate vulnerabilities.
- Penetration Testing: Perform penetration testing to assess the security of WebSocket endpoints and OCPP implementations.
Conclusion: CVE-2026-20781 highlights the critical importance of implementing robust authentication mechanisms for WebSocket endpoints in charging infrastructure. Organizations must prioritize security measures to prevent unauthorized access, data manipulation, and potential operational disruptions. By adopting the recommended mitigation strategies and maintaining vigilant monitoring, organizations can enhance the security posture of their charging infrastructure and protect against potential cyber threats.