CVE-2026-27653 in SecureBrowser for OneGate
Summary
by MITRE • 02/27/2026
The installers for multiple products provided by Soliton Systems K.K. contain an issue with incorrect default permissions, which may allow arbitrary code to be executed with SYSTEM privileges.
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Analysis
by VulDB Data Team • 03/17/2026
The vulnerability identified as CVE-2026-27653 affects multiple installer packages distributed by Soliton Systems K.K. This security flaw stems from improper default permission settings within the installation processes of various software products. The issue creates a critical pathway for privilege escalation attacks that can ultimately result in complete system compromise. The installer components fail to properly configure file and directory permissions during the installation sequence, leaving critical system resources accessible to unauthorized users or processes. This misconfiguration allows malicious actors to inject code into the installation process or modify existing installation files, potentially executing arbitrary code with the highest system privileges available. The vulnerability represents a fundamental failure in the principle of least privilege during software deployment, where installation packages do not adequately protect system integrity. Attackers exploiting this weakness can leverage the elevated permissions to establish persistent access, modify system configurations, or install additional malicious software without requiring additional authentication or authorization steps.
The technical implementation of this vulnerability aligns with CWE-276, which specifically addresses incorrect permissions for critical system resources. This flaw operates at the intersection of software installation security and privilege management, where the default installation process does not properly enforce access controls. The installer packages fail to set appropriate discretionary access control lists or file permissions that would normally prevent unauthorized modification or execution of critical system components. During the installation process, files and directories are created with overly permissive settings that allow any user account to modify or execute components that should only be accessible to system administrators or the installation process itself. This misconfiguration creates a persistent security boundary failure where the installation environment becomes a vector for privilege escalation attacks. The vulnerability is particularly dangerous because it affects the installation phase rather than runtime operations, meaning that any user with access to the installation process can potentially compromise the entire system.
The operational impact of CVE-2026-27653 extends far beyond simple privilege escalation, representing a severe threat to enterprise security infrastructure. Organizations using affected Soliton Systems K.K. products face significant risk of complete system compromise, as the vulnerability allows attackers to execute code with SYSTEM privileges without requiring elevated user credentials. This capability enables attackers to bypass traditional security controls, modify system binaries, create backdoor access points, and establish persistent footholds within networks. The vulnerability affects multiple products simultaneously, amplifying the potential impact across different software ecosystems. Security teams must consider that compromised installations can serve as launching points for lateral movement within networks, potentially affecting multiple systems that depend on the vulnerable software. The attack surface expands significantly as this vulnerability can be exploited through various attack vectors including social engineering, supply chain compromises, or direct exploitation of the installation process. Organizations may experience data breaches, system outages, or complete loss of system control if this vulnerability is successfully exploited in production environments.
Mitigation strategies for CVE-2026-27653 require immediate action from affected organizations to address the root cause of the permission misconfiguration. The primary recommendation involves updating to patched versions of the affected Soliton Systems K.K. products as soon as available from the vendor. Organizations should conduct thorough inventory assessments to identify all systems running vulnerable software installations and perform immediate remediation of any existing installations. Security teams must implement strict access controls around installation processes, ensuring that only authorized personnel can execute installation packages with elevated privileges. Network segmentation and monitoring should be enhanced to detect unusual installation activities or unauthorized modifications to system files. The implementation of application whitelisting policies can prevent execution of unauthorized code during installation phases. Additionally, organizations should conduct comprehensive security audits of their software deployment processes to identify similar permission misconfigurations in other third-party applications. System administrators should review and tighten default permissions on installation directories and ensure that proper access controls are enforced throughout the installation lifecycle. This vulnerability demonstrates the critical importance of secure software development practices and proper permission management during installation processes, aligning with ATT&CK technique T1068 which covers privilege escalation through local system exploitation. Organizations should also consider implementing automated vulnerability scanning tools that can detect similar permission misconfigurations in their software ecosystems.