CVE-2026-54200 in TeamDavid
Summary
by MITRE • 08/07/2026
Tobit Laboratories AG TeamDavid's Webbox is vulnerable to a local file inclusion vulnerability in the send email, fax, SMS, etc. functionality. By specifying an '@@attach' command in the form field 'scjob', files can be attached to a message, which can then be downloaded by an authenticated user. A filter is in place that restricts access to the David con-fig folder and the user folder. However, this filter can be bypassed by specifying an alternate data stream, allowing the download of sensitive files such as other users' access files containing their passwords or the server's private key. This issue affects TeamDavid through Rollout 524.
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Analysis
by VulDB Data Team • 08/07/2026
The vulnerability in Tobit Laboratories AG TeamDavid's Webbox represents a critical local file inclusion flaw that compromises the security of email, fax, and SMS functionality within the system. This weakness manifests through the 'scjob' form field where attackers can inject '@@attach' commands to specify files for message attachment. The vulnerability is particularly concerning because it operates within authenticated user contexts, meaning malicious actors must first establish legitimate access but can then exploit this flaw to escalate their privileges and gain unauthorized access to sensitive system resources.
The technical implementation of this vulnerability stems from inadequate input validation and filtering mechanisms within the file attachment functionality. While the system attempts to protect sensitive directories such as the David configuration folder and user folders through access restrictions, these protective measures prove insufficient against sophisticated attackers who can leverage alternate data streams to bypass the established filters. This bypass technique allows attackers to circumvent the intended security boundaries and access files that should remain protected, including other users' authentication credentials and the server's private cryptographic keys.
The operational impact of this vulnerability extends far beyond simple unauthorized file access, as it provides attackers with potential pathways to compromise entire user sessions and system integrity. When combined with the ability to download users' access files containing passwords, the vulnerability enables credential theft that can lead to persistent unauthorized access across multiple user accounts. Additionally, access to the server's private key represents a particularly severe risk as it could allow attackers to impersonate the server, decrypt communications, or establish further footholds within the network infrastructure.
Security professionals should note this vulnerability aligns with common weakness enumerations such as CWE-22 - Improper Limitation of a Pathname to a Restricted Directory and CWE-94 - Improper Control of Generation of Code. The attack pattern described corresponds to techniques found in the ATT&CK framework under T1059 - Command and Scripting Interpreter and T1566 - Phishing, with potential lateral movement capabilities through credential compromise. Organizations should prioritize immediate patching of affected systems running TeamDavid Rollout 524 or earlier versions while implementing enhanced monitoring for suspicious file attachment activities.
Mitigation strategies should include comprehensive input validation for all user-supplied data, particularly within the scjob field processing logic that currently permits the injection of '@@attach' commands. Network segmentation and principle of least privilege access controls must be strengthened to limit what files can be accessed even if bypass attempts occur. Regular security audits should verify that alternate data stream handling is properly restricted across all file system operations. Additionally, implementing robust logging and alerting mechanisms around file attachment activities will help detect potential exploitation attempts before they succeed in accessing sensitive resources.
The vulnerability demonstrates the importance of defense-in-depth strategies where multiple layers of protection work together to prevent single points of failure. Organizations should also consider implementing automated security scanning tools that can identify similar patterns in other web applications and ensure that access controls are properly enforced across all system components, not just those directly exposed to user input processing. Regular security training for developers regarding secure coding practices and proper validation techniques remains crucial in preventing such vulnerabilities from being introduced into production systems.
This particular flaw underscores the need for comprehensive security testing throughout the software development lifecycle, particularly around file handling and access control mechanisms. The combination of authenticated access requirements with insufficient filtering logic creates a dangerous scenario where legitimate users can be exploited to gain unauthorized access to system resources through carefully crafted inputs that bypass intended security controls.