What is the CVSS score of CVE-2026-26051?

CVE-2026-26051 has a CVSS 4.0 base score of 9.3 (Critical). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2026-26051?

Within 24 hours: Identify all WebSocket endpoints in production and assess which handle sensitive operations; notify incident response team and relevant business units. Within 7 days: Implement network segmentation to restrict WebSocket access to trusted networks only; deploy WAF rules to enforce authentication tokens; disable non-essential WebSocket features. Within 30 days: Develop and execute a compensating control strategy; coordinate with vendor on patch timeline; conduct security assessment of all affected systems.

E Mobility CVE-2026-26051

CRITICAL

Missing Authentication for Critical Function (CWE-306)

2026-03-06 ics-cert@hq.dhs.gov

Authentication Bypass Privilege Escalation E Mobility Mvm

9.3

CVSS 4.0 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Discover charging station identifier
Delivery

Connect to OCPP WebSocket endpoint
Exploit

Impersonate legitimate charger
Execution

Issue unauthorized OCPP commands
Impact

Manipulate charging infrastructure data

Vulnerability Assessment

Weakness	CWE CWE-306 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication required for critical functions MITRE ATT&CK 1 technique across 1 tactic: Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	No special conditions — remote unauthenticated exploitation against default OCPP WebSocket endpoints lacking authentication on charging station management systems.
Impact	CVSS 9.4.
Exploit ScenarioDerived	Unauthenticated WebSocket access.

Act Now Prioritize within 24-48h. Why: CRITICAL severity.

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

WebSocket auth bypass — same industrial platform family.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 22:06 CVSS 9.4

WebSocket auth bypass.

RemediationAI

Apply patch.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-306.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.3 CRITICAL

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

None

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

Low

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

CVSS changed

May 05, 2026 - 18:52 NVD

9.4 (CRITICAL) 9.3 (CRITICAL)

CVE Published

Mar 06, 2026 - 15:16 nvd

CRITICAL 9.4

DescriptionCVE.org

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.

Executive ViewAI

Why It Matters

CVE-2026-26051 allows attackers to bypass authentication on WebSocket endpoints and impersonate stations or alter backend data without authorization. This critical vulnerability (CVSS 9.4) poses immediate risk to data integrity, operational continuity, and regulatory compliance if your organization operates station-based systems or IoT infrastructure.

Business Impact: Severe

Compensating Controls

Implement Web Application Firewall (WAF) rules requiring valid authentication tokens on all WebSocket connections; enforce network segmentation restricting WebSocket access to internal/trusted networks only; disable WebSocket endpoints not critical to operations; implement real-time monitoring and alerting for unauthorized WebSocket connection attempts; require VPN/mTLS for all WebSocket clients; implement request signing and validation at the application layer; regularly audit WebSocket logs for anomalous station impersonation patterns.

Threat Intelligence Overview

EPSS Score

0.1%

Top 69% exploitable

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

EPSS

GitHub

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

CRITICAL severity

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Out-of-Cycle

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact

Very High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +46

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.