CVE-2024-27781 in FortiSandbox
Summary
by MITRE • 02/11/2025
An improper neutralization of input during web page generation ('cross-site scripting') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.4, FortiSandbox 4.2.1 through 4.2.6, FortiSandbox 4.0.0 through 4.0.4, FortiSandbox 3.2 all versions, FortiSandbox 3.1 all versions, FortiSandbox 3.0 all versions allows an authenticated attacker to execute unauthorized code or commands via crafted HTTP requests.
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Analysis
by VulDB Data Team • 01/14/2026
This cross-site scripting vulnerability in Fortinet FortiSandbox affects multiple versions across different release series, creating a significant security risk for organizations relying on this network security appliance. The flaw exists in the web page generation process where input validation is insufficiently implemented, allowing malicious actors to inject malicious scripts into web responses. The vulnerability specifically impacts versions 4.4.0 through 4.4.4, 4.2.1 through 4.2.6, 4.0.0 through 4.0.4, and all versions of the 3.2, 3.1, and 3.0 release lines, indicating a widespread issue affecting the entire FortiSandbox product family. The vulnerability is classified as CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a well-documented weakness in web application security that has been consistently identified in security frameworks and standards. This weakness falls under the ATT&CK technique T1566.001 - Phishing, as it enables attackers to craft malicious web content that can be executed in the context of authenticated users.
The security implications of this vulnerability are severe as it allows authenticated attackers to execute unauthorized code or commands through crafted HTTP requests. This means that an attacker who has gained access to the FortiSandbox system through legitimate authentication can leverage this flaw to escalate their privileges and potentially gain full control over the appliance. The authenticated nature of the attack reduces the barrier to exploitation compared to unauthenticated vulnerabilities, as the attacker only needs valid credentials to access the system. The crafted HTTP requests can contain malicious payloads designed to exploit the XSS vulnerability, potentially leading to session hijacking, data exfiltration, or complete system compromise. The impact extends beyond the immediate appliance as FortiSandbox is typically used for malware analysis and network security monitoring, making it a critical component in enterprise security infrastructure.
Organizations using affected FortiSandbox versions should implement immediate mitigations to protect their networks from potential exploitation. The primary recommendation involves applying the latest firmware updates from Fortinet, which contain patches specifically addressing this XSS vulnerability. Network segmentation should be implemented to limit access to the FortiSandbox appliance to authorized personnel only, reducing the attack surface. Input validation measures should be strengthened at the network level to filter suspicious HTTP requests before they reach the vulnerable appliance. Security monitoring should be enhanced to detect anomalous behavior patterns that might indicate exploitation attempts. Additionally, implementing web application firewalls and content security policies can provide additional layers of protection against malicious script injection attempts. Organizations should also conduct thorough security assessments to identify any potential compromise of their FortiSandbox systems and review access controls to ensure that only necessary personnel have authentication credentials. The vulnerability represents a critical risk to enterprise security infrastructure and requires immediate attention to prevent potential exploitation that could lead to significant security breaches and data loss.