CVE-2026-104811 in MiVoice Office 400
Summary
by MITRE • 10/05/2026
DigitalCanion SA has discovered a vulnerability that allows remote attackers to execute arbitrary code on affected installations of the product. Authentication may be required to exploit this vulnerability.
The specific flaw exists within the Configuration → Services → Music on Hold functionality of the web portal listening on TCP port 443. The application is intended to allow users to upload WAV audio files but fails to properly validate the uploaded file type. An attacker can exploit this behavior to upload a malicious shared object (.so) instead of a WAV file. When the uploaded file is subsequently processed by the affected component, attacker-controlled code is loaded and executed in the context of the affected process. This can result in remote code execution and potentially full compromise of the underlying Linux system.
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Analysis
by VulDB Data Team • 10/05/2026
DigitalCanion SA has identified a critical security vulnerability within their product that enables remote attackers to achieve arbitrary code execution on compromised systems. While authentication is typically required to access the administrative interface, this requirement does not mitigate the severity of the flaw if valid credentials are obtained through phishing or credential stuffing attacks. The core issue resides in the web portal's Configuration module, specifically within the Services section under Music on Hold functionality, which operates over TCP port 443. This component is designed to facilitate the upload and management of WAV audio files for use as hold music during call queues. However, the implementation fails to enforce strict file type validation or content verification mechanisms when processing user-uploaded assets.
The technical flaw stems from an insufficient input validation process that allows attackers to bypass expected file format restrictions. Instead of uploading a legitimate Waveform Audio File Format (WAV) file, an adversary can craft and submit a malicious shared object library with the .so extension. Because the application does not adequately inspect the binary content or enforce MIME type consistency against actual file headers, it accepts this disguised payload as valid input. When the system subsequently processes the uploaded artifact to integrate it into the Music on Hold service, the underlying software incorrectly interprets the malicious shared object as executable code rather than rejecting it as an invalid media file.
This misinterpretation leads directly to a remote code execution scenario where attacker-controlled instructions are loaded and executed within the context of the affected application process. The consequences of this exploitation are severe, potentially resulting in full compromise of the underlying Linux operating system hosting the product. Once arbitrary code is executed with the privileges of the vulnerable service account, an adversary can escalate privileges, install backdoors, exfiltrate sensitive data, or pivot to other systems within the network infrastructure. This vulnerability aligns closely with CWE-434, which describes the unrestricted upload of files with dangerous types, and maps to MITRE ATT&CK technique T1505.003 for Server Component Binary Injection, highlighting how attackers can leverage legitimate system components to maintain persistence or execute malicious payloads undetected by standard security controls.
To mitigate this risk, immediate remediation should focus on implementing robust file validation strategies that verify both the file extension and the actual binary content using magic numbers or library-based parsing tools like libmagic. Developers must ensure that only whitelisted audio formats are accepted and that any uploaded files are stored in non-executable directories to prevent direct execution by the web server or application runtime environment. Additionally, applying principle of least privilege to the service account running the affected component can limit the blast radius if an exploit is successful. Organizations should also enforce multi-factor authentication for administrative access to reduce the likelihood of credential compromise and regularly update their software to ensure all known vulnerabilities are patched according to vendor advisories.