CVE-2026-54217 in TeamDavid
Summary
by MITRE • 08/07/2026
Tobit Laboratories AG TeamDavid's Webbox application is vulnerable to a stored XSS vulnerability. An attacker can send an email containing malicious JavaScript code. When a user accesses the email, the stored cross-site scripting is triggered. 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 application represents a critical stored cross-site scripting flaw that enables attackers to execute malicious JavaScript code within the context of victim users' browsers. This security weakness specifically impacts the email handling functionality of the Webbox application, where user-generated content containing malicious scripts can be persistently stored and later executed when legitimate users access their email messages. The vulnerability exists in TeamDavid's Rollout 524 version and demonstrates a fundamental failure in input validation and output sanitization mechanisms within the email processing pipeline.
The technical exploitation of this stored XSS vulnerability occurs through carefully crafted email messages that contain malicious JavaScript payloads embedded within email content. When a victim user accesses their email through the Webbox application, the malicious code is automatically executed in their browser context without proper sanitization or escaping of user-supplied data. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting flaws where untrusted data is directly included in web pages without proper validation or encoding. The attack vector leverages the trust relationship between the Webbox application and its users, allowing malicious actors to bypass normal security controls by injecting code that executes within the victim's browser session.
The operational impact of this vulnerability extends beyond simple script execution as it provides attackers with the ability to perform various malicious activities including session hijacking, credential theft, data exfiltration, and redirection to phishing sites. Attackers can exploit this flaw to steal user authentication tokens, access sensitive email content, modify user settings, or even escalate privileges within the Webbox environment. The persistent nature of stored XSS means that the malicious code remains active until manually removed from the system, potentially affecting multiple users over extended periods. This vulnerability directly aligns with ATT&CK technique T1566 which describes social engineering attacks through email, and T1071.004 which covers application layer protocol usage for command and control communications.
Mitigation strategies for this stored XSS vulnerability should include comprehensive input validation and output encoding across all user-supplied data within the Webbox email processing system. Implementing strict content security policies, employing proper HTML escaping mechanisms, and utilizing modern web application security frameworks can effectively prevent malicious script execution. Regular security updates and patches should be applied to ensure the latest protections against known XSS vectors are in place. Additionally, implementing web application firewalls and monitoring for suspicious email content patterns can provide additional layers of defense. Organizations using TeamDavid Webbox should conduct thorough security assessments and penetration testing to identify potential attack surfaces while maintaining detailed logging of email processing activities to detect anomalous behavior that might indicate exploitation attempts.