CVE-2026-34007 in Notes Station
Summary
by MITRE • 10/15/2026
An OS command injection vulnerability has been reported to affect Notes Station 3. If exploited, the vulnerability could allow remote attackers to execute arbitrary commands.
We have already fixed the vulnerability in the following version: Notes Station 3 3.9.11 and later
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Analysis
by VulDB Data Team • 10/15/2026
The discovery of an operating system command injection vulnerability within Synology's Notes Station 3 application represents a critical security failure that compromises the integrity and availability of the underlying host system. This specific flaw allows remote, unauthenticated attackers to inject malicious commands into the application environment by manipulating input parameters or request fields that are improperly sanitized before being passed to the OS shell for execution. The presence of such a vulnerability indicates a fundamental lapse in secure coding practices, specifically regarding the handling of user-supplied data and the separation between application logic and system-level operations. In modern web application architecture, any component that interfaces with the operating system must rigorously validate all inputs against a strict whitelist of expected characters or patterns to prevent shell metacharacters from being interpreted as executable instructions rather than literal string values.
From a technical perspective, this vulnerability aligns directly with Common Weakness Enumeration identifier CWE-78, which defines improper neutralization of special elements used in an OS command. The exploitation mechanism typically involves crafting specific HTTP requests where parameters containing shell metacharacters such as semicolons, pipes, or backticks are embedded within the data payload. When Notes Station 3 processes these inputs without adequate filtering or escaping, it inadvertently constructs a composite command string that includes both legitimate application instructions and attacker-controlled payloads. This allows the execution of arbitrary commands with the privileges granted to the web service process, which often runs under elevated permissions to facilitate file system access and network operations for users.
The operational impact of this vulnerability is severe due to its potential for remote code execution without authentication. An adversary who successfully exploits this flaw can achieve complete control over the affected server instance. This capability enables a wide range of malicious activities including data exfiltration, installation of persistent backdoors, lateral movement within the network by scanning internal services, and destruction or encryption of critical data through ransomware deployment. Because Notes Station is often deployed in enterprise environments where it may have access to sensitive documents stored on NAS devices, the compromise extends beyond mere system availability to significant confidentiality breaches affecting organizational intellectual property and personal user information.
This incident maps closely to several tactics within the MITRE ATT&CK framework, particularly T1059 Command and Scripting Interpreter for initial execution and T1086 Web Service for lateral movement or persistence if combined with other vulnerabilities. The ability to execute arbitrary commands effectively bypasses traditional perimeter defenses since it leverages legitimate application functionality as a vector for attack. Defense-in-depth strategies are essential here, as relying solely on input validation is insufficient given the complexity of modern web applications and the evolving sophistication of automated exploitation tools that target known command injection flaws in widely used software components like Notes Station.
To mitigate this risk immediately, organizations running Synology NAS devices must upgrade their DSM operating system to include Notes Station version 3.9.11 or later, as these versions contain the necessary patches for input validation and sanitization routines. Until patching is complete, administrators should consider restricting network access to the Notes Station service by configuring firewall rules that limit connectivity to trusted IP addresses only, thereby reducing the attack surface exposed to potential remote exploitation. Additionally, implementing Web Application Firewalls with specific rule sets designed to detect OS command injection patterns can provide an additional layer of protection against automated scanning and exploitation attempts targeting this vulnerability class.