CVE-2026-27772

Critical

Published: 27 February 2026

Published

27 February 2026

Modified

05 March 2026

KEV Added

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Patch

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CVSS Score 9.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

EPSS Score 0.0020 41.3th percentile

Risk Priority 19 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-27772 is a critical-severity Missing Authentication for Critical Function (CWE-306) vulnerability in Ev.Energy Ev.Energy. Its CVSS base score is 9.4 (Critical).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 41.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 AC-17 (Remote Access) and AC-3 (Access Enforcement).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

IA-3 Device Identification and Authentication good match

prevent

Requires identification and authentication of charging station devices before establishing WebSocket connections, directly preventing unauthorized impersonation and command manipulation.

AC-3 Access Enforcement good match

prevent

Enforces approved access authorizations for WebSocket endpoints, blocking unauthenticated access to OCPP functions and data manipulation.

AC-17 Remote Access good match

prevent

Establishes authentication and usage restrictions for remote access methods like OCPP WebSocket, mitigating unauthenticated station connections.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1068 Exploitation for Privilege Escalation Privilege Escalation

Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.

attack.mitre.org →

Why these techniques?

The vulnerability involves unauthenticated exploitation of public-facing WebSocket endpoints (T1190) enabling privilege escalation to unauthorized control and data manipulation.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

NVD 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.

Deeper analysisAI

CVE-2026-27772 is a critical vulnerability in OCPP WebSocket endpoints that lack proper authentication mechanisms, allowing attackers to perform unauthorized station impersonation and manipulate data sent to the backend. Published on 2026-02-27, it affects EV charging infrastructure software utilizing these endpoints, as detailed in CISA ICS Advisory ICSA-26-057-07 and associated with ev.energy. Mapped to CWE-306 (Missing Authentication for Critical Function), the issue enables unauthenticated connections where attackers use a known or discovered charging station identifier to issue or receive OCPP commands as a legitimate charger.

An unauthenticated attacker with network access can exploit this vulnerability due to its low attack complexity and lack of prerequisites (CVSS v3.1 base score of 9.4: AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L). Successful exploitation allows privilege escalation, unauthorized control of charging infrastructure, and corruption of charging network data reported to the backend, potentially disrupting operations and compromising the integrity of EV charging systems.

Mitigation guidance is provided in CISA ICS Advisory ICSA-26-057-07 (https://www.cisa.gov/news-events/ics-advisories/icsa-26-057-07) and the corresponding CSAF document (https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-057-07.json), with additional vendor information available at https://www.ev.energy/en-us.