CVE-2026-10138 in Totolink
Summary
by MITRE • 10/20/2026
A OS command injection vulnerability exists in the boa formUpload() functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger this vulnerability.
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Analysis
by VulDB Data Team • 10/20/2026
The identified vulnerability represents a critical OS command injection flaw located within the formUpload() function of the boa web server implementation found in TOTOLINK-X2000R routers running version V1.0.0-B20250421.1327 or earlier. This specific component is responsible for handling file upload requests via HTTP, a common feature in embedded networking devices that allows users to manage firmware images, configuration files, or other data through the device's web interface. The core technical flaw stems from insufficient input validation and sanitization of user-supplied parameters passed during the form submission process. When an authenticated attacker crafts a malicious HTTP request containing specially designed payload strings within file names or metadata fields, these inputs are directly concatenated into system shell commands without proper escaping or restriction to safe character sets. This lack of boundary checking allows the injected command sequences to be interpreted and executed by the underlying operating system rather than being treated as literal data for file storage.
From a technical perspective, this vulnerability aligns with CWE-78 Improper Neutralization of Special Elements used in an OS Command, commonly known as OS Command Injection. The attacker leverages standard shell metacharacters such as semicolons or pipe symbols to break out of the intended command context and append arbitrary system commands. Because the boa web server typically runs with elevated privileges on embedded Linux systems often lacking strict sandboxing mechanisms like SELinux in enforcing modes, the executed code inherits the permissions of the web service process. This privilege level is frequently sufficient to achieve full control over the device's operating environment, enabling the attacker to read sensitive configuration files containing network credentials, modify system settings, install persistent backdoors, or pivot into other devices on the local network segment.
The operational impact of this vulnerability is severe due to its authenticated nature and high severity rating under CVSS metrics related to code execution potential. Although authentication is required, many IoT deployments suffer from weak default passwords, reused credentials across multiple devices, or lack of multi-factor authentication, making it relatively easy for adversaries to gain the necessary access level. Once exploited, the attacker can achieve arbitrary remote code execution with root-level privileges on the router. This compromises not only the confidentiality and integrity of the device itself but also its availability as a network gateway. The compromised router may be used to intercept unencrypted traffic, perform man-in-the-middle attacks against connected clients, or serve as an entry point for lateral movement within the internal network infrastructure, potentially leading to broader organizational compromise.
Mitigation strategies must address both immediate remediation and long-term security posture improvements. The primary corrective action is to apply the vendor-provided firmware update that patches the formUpload() function by implementing strict input validation, whitelisting allowed characters in filenames, and using safe API calls for command execution instead of direct shell interpretation. Until patching is feasible, administrators should enforce strong, unique passwords for all administrative accounts and disable remote management interfaces if not strictly required. Network segmentation can also limit the blast radius by isolating IoT devices from critical internal resources. Furthermore, organizations should monitor ATT&CK techniques related to Command and Scripting Interpreter abuse and lateral movement via compromised network infrastructure components to detect potential exploitation attempts in real-time through intrusion detection systems configured with signatures for common command injection payloads.