CVE-2023-54400 in Fumeng Cloud
Summary
by MITRE • 09/29/2026
Fumasoft Fumeng Cloud contains a SQL injection vulnerability in the AjaxMethod.ashx endpoint that allows unauthenticated remote attackers to inject arbitrary SQL through the Name parameter of the getEmpByname action without any authentication. Attackers can exploit UNION-based SQL injection techniques against the Microsoft SQL Server backend to extract, disclose, and modify database contents, with potential for further compromise of the underlying server. Exploitation evidence was first observed by the Shadowserver Foundation on 2023-10-18.
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Analysis
by VulDB Data Team • 09/29/2026
The vulnerability identified in Fumasoft Fumeng Cloud represents a critical security flaw located within the AjaxMethod.ashx endpoint, specifically affecting the getEmpByname action. This component is designed to retrieve employee information based on a provided name parameter but fails to implement adequate input validation or sanitization mechanisms before processing user-supplied data. As a result, unauthenticated remote attackers can interact with this endpoint directly over the network without needing valid credentials. The absence of authentication requirements significantly lowers the barrier for exploitation, allowing any internet-connected actor to initiate attacks against the application infrastructure. This lack of access control is particularly dangerous in enterprise environments where sensitive employee and organizational data resides within the backend database systems.
The core technical flaw constitutes a classic SQL injection vulnerability, categorized under CWE-89: Improper Neutralization of Special Elements used in an SQL Command. The attacker exploits this weakness by injecting malicious SQL syntax into the Name parameter. By utilizing UNION-based techniques, adversaries can append additional SELECT statements to the original query executed against the Microsoft SQL Server backend. This technique allows the injection payload to align with the column count and data types expected by the application, thereby enabling the extraction of arbitrary database contents. The attacker can retrieve sensitive information such as usernames, password hashes, internal configuration details, or proprietary business logic stored within the database tables. Furthermore, depending on the privileges granted to the database account used by the web application, it may be possible to modify existing records or even execute administrative commands that impact the underlying server environment.
The operational impact of this vulnerability extends beyond simple data disclosure. Since Fumeng Cloud is a business management solution, compromising its integrity can lead to severe consequences for affected organizations including financial fraud through manipulated transactional data, reputational damage from publicized breaches, and regulatory non-compliance with standards such as GDPR or HIPAA if personal identifiable information is exposed. The exploitation evidence observed by the Shadowserver Foundation on October 18, 2023 indicates that this vulnerability has been actively targeted in the wild. This real-world activity suggests that automated scanning tools are likely probing for this specific endpoint and parameter combination across the internet. Organizations running unpatched versions of Fumasoft Fumeng Cloud face an immediate risk of data exfiltration and potential full system compromise if the database service account possesses elevated privileges on the host server.
To mitigate these risks, organizations must prioritize patching to the latest secure version provided by Fumasoft that addresses this input validation deficiency. In the interim, network-level controls should be implemented to restrict access to the AjaxMethod.ashx endpoint only from trusted internal IP ranges if remote access is not strictly required. Additionally, deploying a Web Application Firewall with rules specifically tuned for SQL injection patterns can help block malicious payloads targeting the Name parameter. It is also critical to ensure that the database account used by the application follows the principle of least privilege, limiting its permissions to only what is necessary for normal operation and preventing it from executing administrative commands or accessing unrelated databases. Regular security assessments and penetration testing should be conducted to verify that such input validation controls are functioning correctly across all endpoints within the Fumeng Cloud suite.