CVE-2026-77908 in Dynamics 365
Summary
by MITRE • 09/09/2026
Improper control of generation of code ('code injection') in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 09/09/2026
The vulnerability identified as improper control of the generation of code, commonly referred to as code injection within the context of Microsoft Dynamics 365, represents a critical security flaw that compromises the integrity and availability of enterprise resource planning systems. This specific class of vulnerabilities arises when an application constructs or executes dynamic code based on user-supplied input without adequate validation, sanitization, or escaping mechanisms. In the architecture of Microsoft Dynamics 365, such flaws typically manifest in modules where data is processed for display, storage, or execution logic that involves scripting languages or interpreted components. When these inputs are not rigorously constrained, an attacker can inject malicious scripts or commands into the application's runtime environment. The severity of this issue is amplified by its network-accessible nature and the requirement for only authorized authentication, which lowers the barrier to entry significantly compared to unauthenticated remote code execution vulnerabilities.
From a technical perspective, the core flaw lies in the failure to properly neutralize special elements that could be interpreted as executable commands rather than data. This often occurs when dynamic content generation processes concatenate user input directly into script blocks or configuration files without applying context-aware encoding. For instance, if an application accepts text input and immediately embeds it into a JavaScript function call or a server-side template engine without checking for malicious payloads such as cross-site scripting vectors or command injection sequences, the system becomes susceptible to exploitation. The attacker leverages this lack of input validation to alter the intended logic flow of the application. By injecting carefully crafted code snippets, the adversary can trick the server into executing arbitrary commands within the context of the running process. This capability allows for a wide range of malicious activities, including data exfiltration, privilege escalation, and complete system compromise.
The operational impact of this vulnerability is substantial due to its potential to disrupt critical business operations. Microsoft Dynamics 365 serves as a central hub for customer relationship management, supply chain logistics, financial planning, and human resources in many organizations. A successful exploitation could lead to the unauthorized disclosure of sensitive corporate data, including proprietary intellectual property, personal identifiable information of customers and employees, and confidential financial records. Furthermore, an attacker with code execution capabilities can modify or delete critical database entries, leading to significant operational downtime and reputational damage. The ability to execute code over a network means that the attack surface is broad, potentially affecting any authenticated user who interacts with vulnerable endpoints. This poses a severe risk to business continuity, as recovery from such breaches often requires extensive forensic analysis, system restoration from backups, and potential regulatory penalties under data protection laws like GDPR or CCPA.
In terms of industry standards classification, this vulnerability aligns closely with CWE-94, which describes Improper Control of Generation of Code (Code Injection). It also maps to the MITRE ATT&CK framework, specifically techniques related to Command and Scripting Interpreter abuse, such as T1059 or T1620 if reflective code execution is involved. The requirement for an authorized attacker places this within the context of lateral movement or privilege escalation scenarios where an insider threat or a compromised account is utilized to deepen the breach. Understanding these mappings helps security teams prioritize remediation efforts based on established risk frameworks and ensure that mitigation strategies address both the technical root cause and the broader attack lifecycle implications.
Mitigation strategies must focus on implementing robust input validation and output encoding practices across all application layers. Developers should adopt a whitelist approach for acceptable inputs, ensuring that only expected data formats are processed while rejecting or sanitizing any unexpected characters or structures. Utilizing parameterized queries and safe API calls can prevent the interpretation of user-supplied strings as executable code. Additionally, implementing strict Content Security Policy headers can mitigate the impact if script injection occurs by restricting the sources from which scripts can be loaded. Regular security assessments, including static application security testing and dynamic penetration testing, are essential to identify such flaws early in the development lifecycle. Organizations should also ensure that Microsoft Dynamics 365 is kept up-to-date with the latest cumulative updates provided by Microsoft, as these often contain patches for known vulnerabilities of this nature. Finally, enforcing multi-factor authentication and monitoring for anomalous user behavior can help detect exploitation attempts before they result in significant damage.