CVE-2026-50650
Summary
by MITRE • 07/14/2026
Improper control of generation of code ('code injection') in .NET Framework allows an unauthorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/14/2026
Code injection vulnerabilities in the .NET Framework represent a critical class of security flaws that enable attackers to execute arbitrary code within the context of the affected application or system. This particular vulnerability stems from inadequate validation and sanitization of user inputs during code generation processes, creating opportunities for malicious actors to inject harmful code sequences that can be subsequently executed by the framework. The root cause typically involves insufficient input filtering mechanisms that allow untrusted data to flow directly into code generation functions, particularly those involving dynamic code compilation or script execution within the runtime environment.
The technical implementation of this vulnerability occurs when .NET Framework applications utilize methods such as reflection, dynamic compilation through System.CodeDom, or other code generation APIs without proper sanitization of input parameters. Attackers can exploit these weaknesses by crafting malicious inputs that contain executable code fragments which bypass normal security checks and are subsequently processed as legitimate code by the framework's code generation subsystems. This flaw is particularly dangerous because it operates within the trusted execution context of the .NET runtime, allowing attackers to leverage existing permissions and potentially escalate privileges to gain elevated system access.
From an operational standpoint, this vulnerability poses significant risks to organizations relying on .NET Framework applications for critical business processes. Local privilege escalation attacks can enable malicious users to gain administrative rights on affected systems, potentially leading to complete system compromise and data exfiltration. The attack surface extends beyond individual applications to encompass entire infrastructure components that depend on .NET Framework functionality, making it particularly attractive to threat actors seeking persistent access or lateral movement within networks. Security researchers have identified this as a direct violation of the principle of least privilege and input validation best practices.
Mitigation strategies for this vulnerability encompass multiple layers of defensive measures including strict input validation, implementation of secure coding practices, and regular security updates from Microsoft. Organizations should enforce rigorous sanitization of all user inputs before processing them through code generation functions, implement proper access controls to limit code execution capabilities, and maintain up-to-date .NET Framework installations with security patches. The vulnerability aligns with CWE-94 which specifically addresses "Improper Control of Generation of Code ('Code Injection')" and maps to ATT&CK technique T1059.001 for command and scripting interpreter, as attackers often leverage these vulnerabilities to execute malicious commands through injected code sequences. Regular security audits focusing on dynamic code generation patterns and comprehensive testing of input handling mechanisms are essential components of a robust defense strategy against this class of attacks.