CVE-2026-24301 in Copilot
Summary
by MITRE • 08/18/2026
Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.
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Analysis
by VulDB Data Team • 08/18/2026
The vulnerability identified as improper neutralization of special elements used in a command, commonly referred to as command injection, represents a critical security flaw within the architecture of Microsoft Copilot. This specific type of weakness occurs when software constructs operating system commands using externally influenced input without sufficiently verifying or sanitizing that data. In the context of Microsoft Copilot, this implies that user-supplied inputs, which are intended for legitimate processing tasks such as generating code snippets, answering queries, or formatting text, are inadvertently passed to underlying system shells or command-line interpreters. When these inputs contain maliciously crafted sequences designed to alter the structure of the executed command, they can trick the application into executing arbitrary commands with the privileges granted to the service account running the Copilot process. This fundamental failure in input validation allows an attacker to bypass intended security controls and gain unauthorized access to system resources that should remain isolated from user interaction.
From a technical perspective, this vulnerability falls under the category of CWE-78: Improper Neutralization of Special Elements used in an OS Command. The root cause lies in the application's failure to distinguish between data and code during command construction. If the Copilot service integrates with local tools or executes scripts based on user prompts without rigorous escaping or parameterized execution, it creates a vector for exploitation. An attacker can inject shell metacharacters such as semicolons, pipes, ampersands, or backticks to terminate the intended command and append new ones. For instance, if the application constructs a command like "process_data --input [USER_INPUT]", an attacker could supply "--input; rm -rf /" effectively changing the execution flow to delete critical system files or exfiltrate data. The severity of this flaw is amplified by its potential for remote exploitation, as it allows attackers who can interact with the Copilot interface to execute commands on the host machine over a network connection.
The operational impact of this vulnerability extends beyond simple information disclosure, although that remains a primary concern. While the initial description highlights the ability to disclose information over a network, command injection typically provides far more extensive capabilities depending on the execution context. If the Copilot service runs with elevated privileges or access to sensitive internal networks, an attacker could potentially read configuration files, extract credentials stored in environment variables, query local databases, or pivot further into the corporate infrastructure by executing additional tools like netcat or PowerShell scripts. This transforms a seemingly benign AI assistant interface into a powerful remote code execution vector. The ability to disclose information over a network suggests that the injected commands can be configured to send sensitive data back to an external server controlled by the attacker, leading to significant confidentiality breaches and potential compliance violations under regulations such as GDPR or HIPAA if personal health or financial data is involved.
Mitigation strategies for this vulnerability require both immediate technical fixes and long-term architectural changes. Developers must implement strict input validation that rejects any special characters not explicitly required for legitimate functionality. Where dynamic command execution is unavoidable, parameterized APIs should be used instead of string concatenation to build commands, ensuring that user input is treated strictly as data rather than executable code. Additionally, the principle of least privilege must be enforced by running the Copilot service with minimal necessary permissions, limiting the potential damage if an injection occurs. Network-level controls such as firewalls and intrusion detection systems can also help monitor for anomalous outbound traffic patterns indicative of data exfiltration. From a defense-in-depth perspective, organizations should employ web application firewalls that are configured to detect common command injection payloads in HTTP requests directed at Copilot endpoints.
This vulnerability aligns with the MITRE ATT&CK framework technique T1059: Command and Scripting Interpreter, specifically under sub-techniques related to Windows Command Shell or PowerShell if applicable to the environment. It also relates to T1190: Exploit Public-Facing Application, as Microsoft Copilot is often accessible via web interfaces that are exposed to external users. Addressing this issue requires a comprehensive review of how user inputs flow through the application's backend services before they interact with any operating system components. Security teams should prioritize patching and updating the underlying libraries used by Copilot for command execution and conduct thorough penetration testing focused on injection flaws in all input fields that trigger background processes. Continuous monitoring and logging of command executions initiated by the service can also aid in early detection of exploitation attempts, allowing for rapid incident response before significant data loss occurs.