What is the CVSS score of EUVD-2026-17478?

EUVD-2026-17478 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Is there a patch available for EUVD-2026-17478?

Yes, a patch is available for EUVD-2026-17478. Update the affected software to the latest version immediately.

Microsoft EUVD-2026-17478

| CVE-2026-22569 MEDIUM

Improper Validation of Unsafe Equivalence in Input (CWE-1289)

2026-03-31 Zscaler

Information Disclosure Microsoft

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Patch available

Apr 16, 2026 - 05:29 EUVD

4.8.0.63,4.7.0.141

EUVD ID Assigned

Mar 31, 2026 - 15:31 euvd

EUVD-2026-17478

Analysis Generated

Mar 31, 2026 - 15:31 vuln.today

CVE Published

Mar 31, 2026 - 14:54 nvd

MEDIUM 5.4

DescriptionCVE.org

An incorrect startup configuration of affected versions of Zscaler Client Connector on Windows may cause a limited amount of traffic from being inspected under rare circumstances.

AnalysisAI

Zscaler Client Connector on Windows contains an incorrect startup configuration that permits limited traffic to bypass inspection under rare circumstances, resulting in potential information disclosure and integrity compromise. The vulnerability affects all versions of the product and requires user interaction to exploit, with a CVSS score of 5.4 reflecting the combination of network-based attack vector, low complexity, and low impact on confidentiality and integrity. No evidence of active exploitation or public exploit code has been identified.

Technical ContextAI

Zscaler Client Connector is a Windows-based security agent responsible for intercepting and inspecting network traffic according to organizational security policies. The vulnerability stems from CWE-1289 (Improper Validation of Specified Quantity in Input), indicating that the startup configuration process fails to properly validate or correctly apply inspection parameters during agent initialization. This configuration flaw creates a window where certain traffic flows bypass the intended inspection mechanisms, though the specific traffic types and conditions are limited and rare. The issue is endemic to the client-side implementation rather than the backend infrastructure.

RemediationAI

Organizations should consult the Zscaler Client Connector release summary at https://help.zscaler.com/zscaler-client-connector/client-connector-app-release-summary-2025 to identify and deploy the patched version addressing CVE-2026-22569. Update Zscaler Client Connector to the latest available version as recommended by the vendor advisory. In environments where immediate patching is not possible, validate startup configuration settings and monitor for unusual traffic patterns or inspection bypass indicators. No vendor-confirmed workaround has been identified, making patching the primary remediation path.