CVE-2024-38211 in Dynamics 365
Summary
by MITRE • 08/13/2024
Microsoft Dynamics 365 (on-premises) Cross-site Scripting Vulnerability
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Analysis
by VulDB Data Team • 05/11/2026
This vulnerability resides within Microsoft Dynamics 365 on-premises deployments and represents a classic cross-site scripting flaw that can be exploited by malicious actors to execute arbitrary code within the context of a victim's browser. The vulnerability stems from inadequate input validation and output encoding mechanisms within the web application's user interface components, particularly affecting the way dynamic content is rendered and processed. According to CWE-79, this falls under the category of Cross-site Scripting, which is one of the most prevalent web application security flaws and is consistently ranked among the top ten OWASP risks. The vulnerability allows attackers to inject malicious scripts into web pages viewed by other users, potentially leading to session hijacking, data theft, or unauthorized actions performed on behalf of victims.
The technical implementation of this vulnerability typically occurs when user-supplied input is directly incorporated into web page content without proper sanitization or encoding. In Microsoft Dynamics 365 environments, this can manifest through various entry points including form fields, URL parameters, or API endpoints that handle user data. Attackers can craft malicious payloads that exploit the lack of proper input validation, particularly when dealing with dynamic content generation, custom workflows, or user interface elements that render data without appropriate HTML escaping. The flaw is particularly concerning in on-premises deployments where organizations may have extended attack surfaces and less frequent security updates compared to cloud-based implementations. This vulnerability can be exploited through various attack vectors including phishing campaigns, compromised user accounts, or direct exploitation of exposed web interfaces.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling attackers to escalate privileges within the Dynamics 365 environment. Once an attacker successfully injects malicious scripts, they can leverage the compromised session to access sensitive business data, modify records, create new user accounts, or even execute administrative commands. The attack surface is further expanded when considering that Dynamics 365 often integrates with other Microsoft products and third-party systems, creating potential for lateral movement within the network. From an ATT&CK framework perspective, this vulnerability maps to T1566 (Phishing) and T1059 (Command and Scripting Interpreter) techniques, as attackers can use the XSS flaw to establish persistent access or execute malicious commands. Organizations may face significant business disruption, regulatory compliance issues, and potential data breaches that could result in financial losses and reputational damage.
Mitigation strategies should focus on implementing comprehensive input validation, output encoding, and secure coding practices throughout the application lifecycle. Organizations must ensure that all user-supplied data is properly sanitized before being rendered in web pages, with particular attention to HTML escaping and context-aware encoding. The implementation of Content Security Policy headers can provide additional protection against script injection attacks by restricting the sources from which scripts can be loaded. Regular security assessments and penetration testing should be conducted to identify potential injection points and validate the effectiveness of implemented controls. Microsoft recommends applying the latest security patches and updates, while organizations should also consider implementing web application firewalls and monitoring solutions to detect and prevent exploitation attempts. The security posture can be further strengthened by conducting regular security training for developers and implementing secure coding guidelines that specifically address XSS prevention techniques. Additionally, network segmentation and least privilege access controls can limit the potential impact of successful exploitation attempts, while proper incident response procedures should be established to quickly address any confirmed breaches.