CVE-2026-78202 in Payroll System
Summary
by MITRE • 08/24/2026
A vulnerability was found in itsourcecode Payroll System 1.0. This affects the function save_settings of the file admin_class.php. The manipulation of the argument img results in unrestricted upload. The attack may be performed from remote. The exploit has been made public and could be used.
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Analysis
by VulDB Data Team • 08/24/2026
The identified vulnerability resides within itsourcecode Payroll System version 1.0, specifically targeting the save_settings function located in the admin_class.php file. This flaw represents a critical failure in input validation and access control mechanisms, allowing for an unrestricted file upload attack vector. The core technical issue stems from insufficient sanitization of user-supplied data passed via the img argument. When this parameter is processed by the backend logic, the application fails to adequately verify the file type, size, or content integrity before storing it on the server's filesystem. This lack of rigorous validation enables an attacker to bypass standard security controls that are typically designed to prevent the execution of malicious scripts through uploaded files.
From a technical perspective, this vulnerability is classified under CWE-434, which describes the unrestricted upload of file with dangerous type. By manipulating the img parameter, a remote attacker can craft a request containing a specially formatted payload disguised as an image or other acceptable file extension but actually comprising executable code such as PHP scripts. Once uploaded to a directory that allows script execution, this malicious file provides the attacker with a foothold on the compromised server. The exploit has been publicly disclosed and is readily available for use, significantly lowering the barrier to entry for potential adversaries who may lack advanced exploitation skills. This public availability increases the likelihood of automated scanning tools or opportunistic attackers targeting instances of this software in production environments.
The operational impact of successfully exploiting this vulnerability is severe, potentially leading to full system compromise. An attacker gaining access through an uploaded web shell can execute arbitrary commands on the underlying operating system with the privileges granted to the web server process. This level of control allows for data exfiltration, modification or deletion of critical payroll records, installation of backdoors, and lateral movement within the internal network. Given that this is a payroll system, the confidentiality and integrity of sensitive employee financial information are at immediate risk. Furthermore, the compromise could disrupt business operations by rendering the application unusable through ransomware deployment or defacement, leading to significant reputational damage and potential regulatory penalties under data protection laws such as GDPR or CCPA if personal identifiable information is exposed.
Mitigation strategies must address both the immediate technical flaw and broader security posture improvements. The most effective remediation involves implementing strict server-side validation for all file uploads. This includes verifying MIME types against a whitelist of allowed extensions, checking file signatures rather than relying solely on extensions, and ensuring that uploaded files are stored in directories where script execution is explicitly disabled. Additionally, the save_settings function should enforce robust authentication checks to ensure only authorized administrators can modify system settings or upload configuration images. Implementing Content Security Policy headers and using secure coding practices such as parameterized queries for any database interactions related to file metadata will further harden the application. Organizations running this version of itsourcecode Payroll System are strongly advised to apply vendor-provided patches if available, isolate affected systems from untrusted networks until remediation is complete, and conduct a thorough forensic analysis to determine if an exploitation attempt has already occurred given the public nature of the exploit code.