CVE-2026-105703 in User Registration & Login and User Management System
Summary
by MITRE • 10/06/2026
A vulnerability was determined in PHPGurukul User Registration & Login and User Management System 3.3. The impacted element is an unknown function of the file loginsystem/admin/change-password.php of the component Change Password Handler. This manipulation of the argument currentpassword causes incorrect authorization. Remote exploitation of the attack is possible. The exploit has been publicly disclosed and may be utilized.
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Analysis
by VulDB Data Team • 10/06/2026
The PHPGurukul User Registration, Login, and User Management System version 3.3 contains a critical authentication bypass vulnerability within its administrative change password functionality. This flaw resides in the loginsystem/admin/change-password.php file, specifically affecting an unknown function responsible for validating user credentials during password modification operations. The core technical issue stems from improper validation of the currentpassword argument provided by the client. Instead of rigorously verifying that the supplied current password matches the stored hash or credential data associated with the authenticated session, the system fails to enforce this check correctly. This logical error allows an attacker to manipulate the input parameter in a way that bypasses the authentication gate entirely. Consequently, the application proceeds with the password change operation without confirming the identity of the requester, leading to incorrect authorization decisions where unauthorized entities can assume control over administrative accounts or user profiles by simply providing arbitrary values for the current password field.
From an operational perspective, this vulnerability poses a severe risk to system integrity and confidentiality because it enables remote exploitation. An attacker does not need prior valid credentials for the target account to execute the attack vector. By sending specially crafted HTTP requests to the change-password endpoint, malicious actors can reset passwords for existing users or create new administrative accounts with predetermined credentials. This effectively grants full control over the compromised system components. The impact extends beyond simple unauthorized access; it undermines the fundamental trust model of the application, allowing attackers to escalate privileges, exfiltrate sensitive data stored within the user management database, and potentially pivot to further attacks against backend infrastructure if the admin interface provides access to server configurations or other critical services.
The vulnerability aligns with Common Weakness Enumeration (CWE) category CWE-287, which describes Improper Authentication, as well as CWE-306, Missing Authentication for Critical Function, since the change password operation is a security-critical action that lacks proper verification of user identity before execution. In terms of tactical classification under the MITRE ATT&CK framework, this flaw facilitates Initial Access and Privilege Escalation techniques, specifically those involving credential manipulation or account takeover through weak authentication mechanisms. The fact that an exploit has been publicly disclosed significantly increases the threat landscape, as automated scanning tools and malicious scripts can readily leverage this known weakness to compromise vulnerable instances across the internet without requiring custom development effort from attackers.
To mitigate this vulnerability, immediate remediation is required by patching the affected version of PHPGurukul or migrating to a more secure alternative that adheres to modern authentication standards such as OWASP Authentication Cheat Sheet guidelines. The primary fix involves implementing strict server-side validation for the currentpassword parameter using cryptographic comparison methods against stored credentials before allowing any password update operations. Additionally, developers should enforce multi-factor authentication for administrative functions and implement rate limiting on login and change-password endpoints to prevent brute-force or automated exploitation attempts. Regular security audits and code reviews focusing on input validation logic are essential to identify similar flaws in other parts of the application architecture that may suffer from analogous logical errors in authorization checks.