CVE-2026-110633 in MyReport Updater
Summary
by MITRE • 10/14/2026
MyReport Updater through 2.1.1 contains a local privilege escalation vulnerability that allows low-privileged users to make the SYSTEM updater service install attacker-supplied archives into arbitrary directories. Attackers can use UpdaterManager.exe over gRPC to set a malicious reference server and installLocation, planting a DLL like HID.dll loaded by osk.exe to gain SYSTEM privileges.
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Analysis
by VulDB Data Team • 10/14/2026
MyReport Updater version 2.1.1 contains a critical local privilege escalation vulnerability that stems from improper validation of configuration parameters within the updater service architecture. This flaw allows low-privileged users, who typically have limited access rights on the operating system, to manipulate the behavior of the SYSTEM-level updater service. The core technical issue lies in how the UpdaterManager.exe component processes inputs received over gRPC interfaces without sufficient sanitization or authorization checks regarding destination paths and source servers. By exploiting this weakness, an attacker can instruct the privileged service to download and install files into arbitrary directories on the local system rather than restricting installations to secure, predefined locations. This lack of path validation effectively bypasses standard access control mechanisms, allowing a user with minimal privileges to execute actions that require administrative or SYSTEM-level permissions.
The operational impact of this vulnerability is severe as it facilitates an immediate elevation from low-privileged user context to full SYSTEM privileges on the compromised host. The exploitation chain typically involves configuring UpdaterManager.exe via gRPC to point to a malicious reference server and specifying a target installation location controlled by the attacker. Once these parameters are set, the updater service retrieves the specified archives and extracts them into the designated directory. A common technique for achieving persistent SYSTEM-level code execution in this context is planting a dynamic-link library (DLL), such as HID.dll, within a directory that is subsequently loaded by legitimate system processes like osk.exe, which represents the On-Screen Keyboard utility. Because osk.exe runs with high privileges and loads DLLs from its own directory or specified paths, it inadvertently executes the attacker-supplied malicious code under the SYSTEM account context. This mechanism allows attackers to establish a foothold with maximum control over the operating system, enabling them to install backdoors, exfiltrate sensitive data, modify security policies, or move laterally within a network environment without detection by standard user-level monitoring tools.
From a classification perspective, this vulnerability aligns closely with CWE-269 Improper Privilege Management and CWE-78 OS Command Injection principles adapted for service-based architectures where input validation is insufficient. The exploitation technique of manipulating legitimate system processes to load malicious libraries corresponds directly to the ATT&CK tactic of Defense Evasion through process hollowing or DLL side-loading, specifically mapping to techniques such as T1574.002 Hijack Execution Flow: DLL Side-Loading and potentially T1068 Exploitation for Privilege Escalation if additional vectors are leveraged during the initial access phase. The use of gRPC interfaces also highlights risks associated with CWE-918 Server-Side Request Forgery (SSRF) variants where internal services trust client-supplied URLs without verifying their legitimacy or safety, although in this case, the primary risk is local privilege escalation rather than network-based SSRF.
Mitigation strategies must focus on hardening the configuration and execution environment of MyReport Updater to prevent unauthorized manipulation of service parameters. Immediate remediation involves applying vendor-provided patches that address version 2.1.1 by implementing strict input validation for all gRPC endpoints, ensuring that only whitelisted directories are permitted as installation targets. Administrators should enforce least-privilege principles by restricting write access to system directories and critical application paths where DLL side-loading could occur. Additionally, enabling advanced audit policies to monitor changes in service configurations and file creation events in sensitive locations can aid in early detection of exploitation attempts. Organizations should also consider disabling unnecessary gRPC services if they are not required for business operations, thereby reducing the attack surface available to local attackers. Regular vulnerability assessments and penetration testing focused on privilege escalation vectors will help identify similar misconfigurations across other enterprise software components before they can be exploited by malicious actors seeking SYSTEM-level access.