CVE-2024-38206 in Copilot Studio
Summary
by MITRE • 08/07/2024
An authenticated attacker can bypass Server-Side Request Forgery (SSRF) protection in Microsoft Copilot Studio to leak sensitive information over a network.
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Analysis
by VulDB Data Team • 05/20/2025
Microsoft Copilot Studio contains a server-side request forgery vulnerability that allows authenticated attackers to circumvent existing security controls and access sensitive internal resources. This vulnerability specifically affects the authentication mechanisms within the platform, enabling malicious users with legitimate credentials to forge requests that target internal systems. The flaw exists in how the application processes user-supplied input during request handling, particularly when processing external resource references. Attackers can leverage this weakness to make unauthorized requests to internal services that should normally be restricted, potentially gaining access to confidential data, system information, or administrative functions.
The technical implementation of this vulnerability stems from insufficient validation of request parameters and inadequate restrictions on resource access within the Copilot Studio environment. When authenticated users submit requests that reference external resources, the system fails to properly sanitize or validate the input, allowing crafted requests to bypass security boundaries. This weakness creates an attack surface where internal network resources become accessible through the application's legitimate request processing pathways. The vulnerability aligns with CWE-918, which describes server-side request forgery flaws where applications fail to properly validate and restrict access to external resources. The attack vector typically involves crafting malicious requests that appear legitimate to the system but target internal resources that should remain protected.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable more sophisticated attacks including privilege escalation, lateral movement, and data exfiltration. An attacker who successfully exploits this vulnerability can potentially access internal databases, administrative interfaces, or other sensitive components that are normally isolated from external access. The risk is particularly elevated in enterprise environments where Copilot Studio may have access to multiple internal systems and services. Organizations may experience unauthorized access to confidential business information, customer data, or system configuration details that could be used for further exploitation. This vulnerability directly impacts the principle of least privilege and can undermine the security posture of the entire Microsoft Copilot Studio deployment.
Mitigation strategies should focus on implementing robust input validation, strengthening authentication controls, and establishing proper network segmentation. Organizations should ensure that all user-supplied inputs are properly sanitized and validated before processing, particularly when dealing with external resource references. Network-level controls such as firewalls and access control lists should be configured to restrict access to internal resources from the Copilot Studio environment. Implementing web application firewalls and request filtering mechanisms can help detect and block suspicious patterns that may indicate exploitation attempts. Additionally, regular security updates and patches should be applied promptly to address known vulnerabilities. The mitigation approach should align with ATT&CK technique T1566, which covers server-side request forgery tactics, and should include monitoring for unusual request patterns that could indicate exploitation attempts. Organizations should also consider implementing principle of least privilege access controls and regular security assessments to identify and remediate similar vulnerabilities in their systems.