CVE-2026-30403 in wgcloud
Summary
by MITRE • 03/19/2026
There is an arbitrary file read vulnerability in the test connection function of backend database management in wgcloud v3.6.3 and before, which can be used to read any file on the victim's server.
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Analysis
by VulDB Data Team • 03/24/2026
The arbitrary file read vulnerability identified as CVE-2026-30403 resides within the backend database management functionality of wgcloud version 3.6.3 and earlier releases. This flaw specifically affects the test connection function that administrators use to verify database connectivity. The vulnerability stems from insufficient input validation and sanitization mechanisms within the backend processing logic that handles database connection parameters. Attackers can exploit this weakness by crafting malicious input that bypasses normal file access controls and allows retrieval of arbitrary files from the server filesystem.
The technical implementation of this vulnerability follows a classic path where user-supplied data flows directly into file system operations without proper sanitization. The test connection function likely accepts database connection details including hostnames, ports, and credential information, but fails to validate or sanitize the input parameters that could contain malicious file paths. When the application processes these parameters, it may construct file paths or execute system calls that directly reference user-controlled input, enabling unauthorized file access. This type of vulnerability maps to CWE-22 known as "Improper Limitation of a Pathname to a Restricted Directory" and represents a path traversal attack vector that has been commonly exploited in web applications.
The operational impact of this vulnerability is severe as it provides attackers with unrestricted access to any file on the compromised server. Depending on the server configuration and file permissions, attackers could potentially read sensitive configuration files, database credentials, application source code, or even system files that contain critical information. This access could lead to complete system compromise, data exfiltration, or further lateral movement within the network infrastructure. The vulnerability affects organizations using wgcloud versions up to and including 3.6.3, making it a widespread concern for enterprises that have not yet updated their systems. The attack surface is particularly concerning because database management functions are often accessible to administrators and may have elevated privileges, potentially providing attackers with additional attack vectors.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected wgcloud versions to address the input validation flaws in the test connection function. Organizations should implement proper input sanitization and validation mechanisms that prevent malicious file path traversal attempts. The principle of least privilege should be enforced by limiting the permissions of database management functions and ensuring that file system access is restricted to only necessary operations. Network segmentation and monitoring should be implemented to detect unusual file access patterns that might indicate exploitation attempts. Additionally, organizations should conduct regular security assessments of their database management interfaces to identify similar vulnerabilities in other components. From an ATT&CK framework perspective, this vulnerability maps to T1566.001 "Phishing: Spearphishing Attachment" and T1078.004 "Valid Accounts: Cloud Accounts" as attackers may use this vulnerability to escalate privileges or gain access to additional systems after initial exploitation.