A vulnerability in the CTEK Chargeportal’s WebSocket endpoints allows an attacker to connect without authentication. By using a known or discovered charging‑station identifier, an unauthenticated user can impersonate a legitimate station and issue OCPP commands to the backend. The lack of access control permits privilege escalation, unauthorized control of charging infrastructure, and corruption of data that the backend reports. This defect corresponds to CWE-306, reflecting missing authentication.

The affected product is CTEK Chargeportal. Specific version information is not provided in the public disclosure. The vendor has announced that the product will be sunset in April 2026, indicating that no active maintainer will provide a fix or update for the current release.

The vulnerability carries a CVSS score of 9.3, signifying critical impact. Although the EPSS score is not available, the absence of authentication on a network‑exposed WebSocket endpoint strongly suggests a high likelihood of exploitation. The vendor has not listed this issue in the CISA KEV catalog, but the scenario permits remote attackers to execute arbitrary commands, disrupt operations, and manipulate billing or monitoring data. The attack vector is inferred to be remote over the network, requiring only knowledge of a station identifier to take advantage of the vulnerability.