CVE-2026-20781
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Unauthenticated WebSocket Access Enables OCPP Station Impersonation

Publication date: 2026-02-27

Last updated on: 2026-03-05

Assigner: ICS-CERT

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.

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Meta Information

Published
2026-02-27
Last Modified
2026-03-05
Generated
2026-07-06
AI Q&A
2026-02-27
EPSS Evaluated
2026-07-05
NVD
CVE-2026-20781
EUVD
EUVD-2026-8929

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
cloudcharge cloudcharge.se *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-306 The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

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Executive Summary

This vulnerability occurs because WebSocket endpoints for OCPP (Open Charge Point Protocol) lack proper authentication mechanisms. This means that an attacker who is not authenticated can connect to the OCPP WebSocket endpoint by using a known or discovered charging station identifier.

Once connected, the attacker can impersonate a legitimate charging station and issue or receive OCPP commands as if they were the actual charger.

Impact Analysis

The impact of this vulnerability includes privilege escalation and unauthorized control over the charging infrastructure.

An attacker can manipulate data sent to the backend, potentially corrupting charging network data.

This unauthorized control can disrupt normal operations and compromise the integrity and availability of the charging network.

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