CVE-2026-4793 in Assistant
Summary
by MITRE • 08/03/2026
An incorrect default permissions vulnerability in Synology Assistant before 7.0.7-50095 allows local users to read or write arbitrary files and conduct denial-of-service during installation.
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Analysis
by VulDB Data Team • 08/03/2026
The vulnerability in Synology Assistant prior to version 7.0.7-50095 represents a critical misconfiguration issue that stems from improper default file permissions within the application's installation process. This flaw falls under the category of insecure default configurations and can be categorized as cwe-276 according to the common weakness enumeration framework. The vulnerability specifically affects local users who can exploit the incorrect permission settings to gain unauthorized access to sensitive system resources during the software installation phase.
The technical implementation of this vulnerability occurs when Synology Assistant establishes file permissions with insufficient access controls, allowing local attackers to manipulate or read files that should remain protected. During the installation process, the application creates temporary files or configuration elements with overly permissive settings that enable arbitrary file operations. This misconfiguration creates a window of opportunity for privilege escalation and unauthorized system modifications.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with the capability to execute denial-of-service attacks against the target system. Local users can leverage these permissions to corrupt installation files, modify system configurations, or disrupt normal application functionality through carefully crafted file operations that exploit the relaxed access controls. The vulnerability particularly affects systems where Synology Assistant is installed with default settings, making it a widespread concern across various deployments.
Security professionals should implement immediate mitigations including updating to Synology Assistant version 7.0.7-50095 or later, which addresses the incorrect default permissions issue through proper access control implementation. Additional protective measures involve conducting security audits of existing installations to verify file permissions and implementing principle of least privilege configurations for all system components. The vulnerability also aligns with attack techniques described in the mitre att&ck framework under initial access and privilege escalation categories, specifically targeting local system compromise through configuration weaknesses.
Organizations should establish regular patch management procedures to ensure timely updates of all system components, particularly those that handle installation processes or file operations. The remediation process involves verifying that all temporary files created during installation maintain appropriate access controls and that no unnecessary permissions are granted to local user accounts. This vulnerability demonstrates the importance of secure coding practices and proper permission management in system-level applications, as it can be exploited to undermine system integrity and availability through seemingly minor configuration oversights.