CVE-2024-38166 in Dynamics CRM Service Portal Web Resource
Summary
by MITRE • 08/07/2024
An unauthenticated attacker can exploit improper neutralization of input during web page generation in Microsoft Dynamics 365 to spoof over a network by tricking a user to click on a link.
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Analysis
by VulDB Data Team • 05/20/2025
Microsoft Dynamics 365 contains a vulnerability that allows unauthenticated attackers to perform cross-site scripting attacks through improper input validation during web page generation processes. This flaw resides in the application's handling of user-supplied data within web content rendering mechanisms, creating an avenue for malicious actors to inject arbitrary scripts into web pages viewed by legitimate users. The vulnerability specifically affects the neutralization of input parameters that are subsequently rendered in web contexts without adequate sanitization or encoding measures.
The technical implementation of this vulnerability stems from insufficient validation and sanitization of input data that flows through the web application's rendering pipeline. When user-provided content or parameters are processed and incorporated into dynamic web page generation, the system fails to properly neutralize potentially malicious input sequences that could be interpreted as executable script code. This weakness aligns with common web application security flaws categorized under CWE-79, which addresses cross-site scripting vulnerabilities, and represents a classic example of improper input validation in web applications. Attackers can craft malicious URLs or content that, when clicked by a victim, triggers the execution of unauthorized scripts within the victim's browser context.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking, as it enables attackers to perform sophisticated social engineering campaigns that can compromise user sessions, manipulate application interfaces, and potentially escalate privileges within the Dynamics 365 environment. Users who click on malicious links may unknowingly execute scripts that can steal authentication tokens, modify page content, redirect navigation to malicious sites, or even establish persistent backdoors through advanced exploitation techniques. The unauthenticated nature of this attack means that adversaries require no prior credentials to initiate the exploitation process, making it particularly dangerous for organizations that rely on Dynamics 365 for customer relationship management and business operations.
Organizations should implement immediate mitigations including enhanced input validation controls, proper output encoding for all dynamic content, and comprehensive web application firewall rules that can detect and block suspicious input patterns. The mitigation strategies should align with industry best practices from the OWASP Top Ten and NIST cybersecurity frameworks, focusing on defense-in-depth approaches that include both application-level protections and network-level controls. Regular security assessments and penetration testing should be conducted to identify additional potential vectors that could be exploited through similar input validation weaknesses. Additionally, administrators should monitor user access logs for unusual patterns that may indicate exploitation attempts and maintain up-to-date security patches from Microsoft to address the underlying vulnerability in the Dynamics 365 platform.