What is the CVSS score of CVE-2026-3000?

CVE-2026-3000 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

How to fix or mitigate CVE-2026-3000?

Within 24 hours: Identify all systems running IDExpert Windows Logon Agent and isolate affected systems from production networks if patching cannot be completed immediately. Within 7 days: Apply the available vendor patch to all affected systems and verify successful deployment. Within 30 days: Conduct vulnerability scans and security assessments to confirm remediation and identify any systems that may have been compromised prior to patching.

Idexpert CVE-2026-3000

CRITICAL

Download of Code Without Integrity Check (CWE-494)

2026-03-02 twcert@cert.org.tw

Windows RCE Idexpert Changingtec

9.8

CVSS 3.1 · NVD

View

Attack ChainAIDerived

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

Access

Craft malicious network request to Logon Agent
Exploit

Trigger arbitrary DLL download from attacker server
Execution

Execute downloaded DLL with system privileges
Impact

Achieve remote code execution

Vulnerability Assessment

Weakness	CWE CWE-494 OWASP Top 10:2025 A08:2025 - Software or Data Integrity Failures ASVS 5.0 V15 - Secure Coding and Architecture Code integrity verification
Exploitation Conditions	IDExpert Windows Logon Agent must be installed and accessible over network. No authentication required. Vulnerability exploitable against default installations receiving network traffic on Logon Agent service port.
Impact	CVSS 9.8 with patch. Two unsigned update paths mean the attack surface is doubled.
Exploit ScenarioDerived	An attacker uses this alternative update injection path when the first is patched.

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

Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

IDExpert Windows Logon Agent has a second RCE vulnerability through another unsigned code download path.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 9.8

Second unsigned code download RCE in IDExpert Windows Logon Agent.

RemediationAI

Apply patches for both CVEs.

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-494 in a second code download path in IDExpert, distinct from CVE-2026-2999.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Patch released

Mar 09, 2026 - 14:21 nvd

Patch available

CVE Published

Mar 02, 2026 - 07:16 nvd

CRITICAL 9.8

DescriptionCVE.org

IDExpert Windows Logon Agent developed by Changing has a Remote Code Execution vulnerability, allowing unauthenticated remote attackers to force the system to download arbitrary DLL files from a remote source and execute them.

Executive ViewAI

Why It Matters

IDExpert Windows Logon Agent contains a critical remote code execution vulnerability (CVSS 9.8) that allows unauthenticated attackers to execute arbitrary code on affected systems without authentication. Any organization deploying this agent faces immediate risk of system compromise, data breach, and operational disruption.

Business Impact: Severe

Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score

0.2%

Top 63% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

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 0.2%

Patch available Yes

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.