CVE-2026-27767: WebSocket

Overview

A critical security flaw has been identified in the implementation of WebSocket endpoints used for communication with electric vehicle charging stations. This vulnerability allows an attacker to impersonate a legitimate charging station without requiring any password or authentication key.

Vulnerability in Simple Terms

The system uses a communication channel (WebSocket) that lets charging stations “talk” to the central management backend. The flaw is that this channel does not verify who is connecting. An attacker can simply use the unique identifier of a real charging station-which can often be discovered or guessed-to establish a connection. Once connected, the attacker is treated as that legitimate station, enabling them to send false data or issue malicious commands directly to the backend system.

Potential Impact

The impact of this vulnerability is severe, as it provides unauthorized access to critical infrastructure. Potential consequences include:

• Unauthorized Control: Attackers could remotely start or stop charging sessions, potentially disrupting service or damaging vehicles and equipment.
• Data Corruption: False data, such as incorrect energy usage or fake error reports, could be sent to the backend, crippling billing, monitoring, and maintenance operations.
• Privilege Escalation: By impersonating a station, an attacker could gain a foothold to pivot and attack other, more sensitive parts of the network.
• Network-Wide Disruption: Widespread impersonation could lead to large-scale operational failure and loss of trust in the charging network.

Remediation and Mitigation Advice

Immediate action is required to secure affected systems.

Primary Remediation (Patching): Apply the official security patch or update from your charging management system vendor as soon as it becomes available. This update must enforce strong authentication on all WebSocket connections.

Immediate Mitigations (If a Patch is Not Yet Available):

1. Network Segmentation: Isolate the charging station network (the network where stations connect from) from other critical corporate networks. Restrict inbound connections to the WebSocket endpoint as tightly as possible using firewalls.
2. Access Control Lists (ACLs): Implement network-level ACLs to only allow WebSocket connections from known, legitimate IP address ranges of your charging stations, if feasible.
3. Enhanced Monitoring: Closely monitor WebSocket connection logs for suspicious activity, such as multiple connection attempts, connections from unusual geographic locations, or stations connecting from unexpected IP addresses. Alert on any anomalous behavior.

Long-Term Security Practice: Ensure that all API and communication endpoints, especially those used by IoT and operational technology, are protected with strong, unique authentication credentials or certificates before deployment.