CVE-2026-50768 in ImageMaster
Summary
by MITRE • 08/17/2026
File Upload vulnerability in T-Systems International GmbH ImageMaster Version: 9.14.2.8.1 allows a remote attacker to execute arbitrary code via the add attachments feature in the create new document function.
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Analysis
by VulDB Data Team • 08/17/2026
The identified vulnerability represents a critical security flaw within the file upload mechanism of T-Systems International GmbH's ImageMaster software, specifically affecting version 9.14.2.8.1. This weakness is rooted in insufficient validation and sanitization procedures applied to user-supplied input during the document creation process. When an authenticated or potentially unauthenticated attacker utilizes the add attachments feature within the create new document function, they can bypass standard security controls by uploading maliciously crafted files. The core technical failure lies in the application's inability to adequately distinguish between legitimate file types and executable payloads, allowing attackers to inject scripts or binary executables that are subsequently processed by the server-side environment without proper restriction.
From a technical perspective, this vulnerability aligns with CWE-434, which describes an unrestricted upload of files with dangerous content. The exploitation vector typically involves crafting a request where the file extension is disguised as a benign format such as JPEG or PDF, while the internal structure contains executable code or server-side script commands like PHP, ASP, or JSP. If the application fails to perform deep packet inspection, MIME type verification against actual file signatures, or strict allow-listing of permitted extensions, it may store these files in a web-accessible directory. Once stored, an attacker can trigger execution by accessing the uploaded file through its URL path, leading to remote code execution on the underlying server infrastructure.
The operational impact of this vulnerability is severe and potentially catastrophic for organizational security postures. Successful exploitation allows a remote attacker to gain unauthorized access to the system hosting ImageMaster. This initial foothold can be leveraged to escalate privileges, move laterally across the network, exfiltrate sensitive data stored within or accessible by the application, install backdoors for persistent access, and disrupt business operations through ransomware deployment or service denial. Given that document management systems often handle confidential corporate information, the compromise of this component poses a significant risk to confidentiality, integrity, and availability principles defined in standard security frameworks.
In terms of industry classification standards, this vulnerability maps directly to MITRE ATT&CK technique T1505.003, known as Server Software Component: Web Shell. This tactic involves attackers installing web shells on compromised servers to maintain persistent access and execute commands remotely. The lack of input validation also reflects weaknesses associated with CWE-20, improper input validation, which is a fundamental cause of many injection-based attacks in modern web applications. Understanding these mappings helps security teams prioritize remediation efforts based on established threat intelligence models rather than treating the issue as an isolated incident.
To mitigate this vulnerability and prevent further exploitation, immediate action must be taken to patch or upgrade ImageMaster to a version where the file upload logic has been hardened by T-Systems International GmbH. In addition to applying vendor-provided patches, organizations should implement defense-in-depth strategies such as deploying Web Application Firewalls configured with rulesets that detect malicious file uploads and anomalous HTTP requests. It is also critical to enforce strict server-side configuration controls, including restricting write permissions on directories where files are stored, ensuring uploaded content cannot be executed by the web server engine, and utilizing isolated storage locations outside of the public document root whenever possible. Regular security audits and penetration testing focused on file upload functionalities should become a standard part of the maintenance lifecycle to identify similar weaknesses in other modules before they can be exploited by adversaries.