CVE-2026-78201 in Payroll System
Summary
by MITRE • 08/24/2026
A vulnerability has been found in itsourcecode Payroll System 1.0. The impacted element is the function Login of the file admin_class.php. The manipulation of the argument Username leads to sql injection. The attack is possible to be carried out remotely. The exploit has been disclosed to the public and may 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 affecting the authentication mechanism implemented in the admin_class.php file. This system flaw centers on the Login function, which fails to adequately sanitize or validate user-supplied input before incorporating it into database queries. The critical technical deficiency is a classic SQL injection weakness triggered by improper handling of the Username argument. When an attacker submits specially crafted input for this field, they can manipulate the underlying Structured Query Language statements executed against the backend database. This lack of parameterization allows malicious code to be injected directly into the query structure, bypassing intended logic and altering the execution path of the database operations.
From a technical perspective, this vulnerability aligns with CWE-89, which categorizes Improper Neutralization of Special Elements used in an SQL Command. The root cause is typically the concatenation of user input directly into SQL strings without employing prepared statements or stored procedures that enforce strict type checking and separation between code and data. Because the authentication module processes this input to verify credentials against a database table, the attacker can exploit logical operators within the injected payload to bypass password verification entirely. For instance, by injecting a tautology such as OR 1=1 into the username field, an attacker may force the query to return true for any valid user record in the system, thereby gaining unauthorized access without possessing legitimate credentials.
The operational impact of this vulnerability is severe due to its remote exploitability and public disclosure status. Since the attack vector is network-based, a malicious actor can initiate exploitation from a distant location over the internet or an internal network segment where the application is accessible. The availability of publicly disclosed exploits significantly lowers the barrier to entry for attackers, enabling automated scanning tools and less sophisticated threat actors to compromise the system with minimal effort. Successful exploitation leads directly to unauthorized administrative access, which in a payroll context implies potential exposure of sensitive personally identifiable information including employee salaries, tax details, bank account numbers, and social security identifiers. Furthermore, depending on the database configuration and backend capabilities, this SQL injection could potentially be chained with other techniques such as out-of-band data exfiltration or even remote code execution if specific database features like xp_cmdshell are enabled in Microsoft SQL Server environments.
In terms of threat modeling and industry frameworks, this vulnerability maps to MITRE ATT&CK technique T1059 Command Scripting via SQL commands when used for deeper system compromise, but primarily falls under Initial Access techniques such as Valid Accounts (T1078) if the attacker gains persistent login credentials through credential stuffing or bypass. The public nature of the exploit suggests that automated attacks targeting this specific version and configuration are likely occurring in the wild. Organizations relying on legacy open-source payroll systems must recognize that unpatched versions with known SQL injection flaws represent critical risk vectors for data breaches and regulatory non-compliance under standards such as GDPR, HIPAA, or PCI DSS depending on the jurisdiction and data types involved.
Mitigation strategies should focus immediately on code remediation rather than relying solely on perimeter defenses. The primary fix involves refactoring the Login function in admin_class.php to use parameterized queries or prepared statements for all database interactions involving user input. This ensures that the database engine treats injected characters as literal data values rather than executable SQL commands. Additionally, implementing strict input validation and sanitization routines can provide a defense-in-depth layer by rejecting inputs that do not conform to expected formats, such as alphanumeric strings with limited special character usage for usernames. Web Application Firewalls may offer temporary relief by detecting common SQL injection patterns in HTTP requests, but they are not a substitute for fixing the underlying code defect. Given the public disclosure of exploits, immediate patching or upgrading to a secure version is imperative to prevent unauthorized access and subsequent data compromise.