CVE-2026-18634

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Insecure Deserialization in GMS Application

Publication date: 2026-08-11

Last updated on: 2026-08-28

Assigner: SonicWALL, Inc.

Description

An insecure handling of serialized objects vulnerability was found in the one of the service of GMS application 9.5.1 (Build 9510.1044) and earlier versions. A local attacker with the ability to interact with the service could exploit this behavior to perform unauthorized actions through the affected component.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-08-11

Last Modified

2026-08-28

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-18634

EUVD

EUVD-2026-56945

Affected Vendors & Products

Vendor	Product	Version / Range
sonicwall	gms	to 9.5.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-502	The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Attack-Flow Graph

Executive Summary

This vulnerability involves insecure handling of serialized objects in the GMS application version 9.5.1 (Build 9510.1044) and earlier. A local attacker with service interaction privileges could exploit this to perform unauthorized actions through the affected component.

Detection Guidance

Detection requires identifying the affected GMS application service (version 9.5.1 Build 9510.1044 or earlier). Check running services for SonicWall GMS components and verify version numbers. No specific commands are provided in the context.

Impact Analysis

If you are a user or administrator of the affected GMS application, an attacker with local access could exploit this to perform unauthorized actions, potentially leading to data breaches, system compromise, or other malicious activities.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations using the affected GMS application may face legal and regulatory penalties if exploited.

Mitigation Strategies

Update GMS application to the latest version (9.5.1 or later) to address the insecure serialized object handling. Restrict local access to the affected service to prevent unauthorized interactions. Monitor service logs for suspicious activity related to serialized object processing.

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