CVE-2026-18634 in GMS
Summary
by MITRE • 08/11/2026
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.
VulDB is the best source for vulnerability data and more expert information about this specific topic.
Analysis
by VulDB Data Team • 08/11/2026
This vulnerability represents a critical insecure deserialization flaw that affects the GMS application version 9.5.1 and earlier builds. The issue stems from improper validation and handling of serialized data within one of the application's service components, creating a pathway for malicious exploitation. The vulnerability is classified under CWE-502 which specifically addresses deserialization of untrusted data, making it a well-documented and dangerous security weakness. Attackers can leverage this flaw to execute arbitrary code on the target system through carefully crafted serialized objects that are processed by the vulnerable service.
The technical implementation of this vulnerability allows local attackers to manipulate serialized object data structures that flow through the application's service layer. When the service processes these objects, it fails to properly validate the incoming data before deserializing it, enabling attackers to inject malicious payloads. This type of vulnerability is particularly dangerous because it can be exploited without requiring remote network access, as the attacker only needs local interaction with the vulnerable service component.
The operational impact of this vulnerability extends beyond simple privilege escalation or code execution. It creates a persistent security risk that can allow attackers to gain unauthorized access to sensitive system resources, potentially leading to complete system compromise. The affected service component becomes a vector for privilege escalation attacks where local users can leverage the deserialization flaw to elevate their privileges and gain administrative control over the application environment. This vulnerability directly maps to ATT&CK technique T1548.002 which covers abuse of elevation control mechanisms, and T1059 which addresses command and scripting interpreters.
Mitigation strategies for this vulnerability must include immediate patching of the GMS application to version 9.5.2 or later where the deserialization handling has been properly secured. Organizations should implement strict input validation mechanisms that reject any serialized objects from untrusted sources, along with comprehensive monitoring of service interactions to detect anomalous behavior patterns. Network segmentation and privilege separation can help limit the potential impact if exploitation occurs. Additionally, implementing application whitelisting policies and disabling unnecessary deserialization capabilities within the service components will provide additional defense layers against similar attacks. The vulnerability serves as a reminder of the critical importance of secure coding practices and proper input validation in preventing remote code execution through deserialization flaws.