CVE-2026-90518 in Bank Locker Management System
Summary
by MITRE • 09/13/2026
A security flaw has been discovered in PHPGurukul Bank Locker Management System 1.0. This impacts an unknown function of the file sidebar.php. The manipulation of the argument UserType results in improper access controls. The attack may be launched remotely. The exploit has been released to the public and may be used for attacks.
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Analysis
by VulDB Data Team • 09/13/2026
The PHPGurukul Bank Locker Management System version 1.0 contains a critical security vulnerability within its sidebar.php component, specifically affecting an unspecified function that processes user input related to access roles. This flaw represents a classic case of broken access control, where the application fails to properly enforce restrictions on authenticated users attempting to access resources or perform actions outside their intended privileges. The core technical issue lies in how the system handles the UserType argument passed through HTTP requests. Instead of validating this parameter against a secure server-side session state or database record that defines the user's actual permissions, the application appears to trust client-supplied input directly for authorization decisions. This architectural weakness allows an attacker to manipulate the UserType value to escalate privileges from a standard end-user role to an administrative level without possessing valid credentials for such elevated access.
From a technical perspective, this vulnerability aligns with CWE-269, which categorizes Improper Privilege Management, and more specifically reflects patterns associated with CWE-862, Missing Authorization Checks. The flaw enables remote attackers to bypass security mechanisms by injecting or modifying the UserType parameter in network requests targeting the sidebar.php endpoint. Since the manipulation occurs at a point where access control decisions are made but not strictly enforced against verified identity data, the system grants unauthorized capabilities based solely on the manipulated input value. This type of vulnerability is particularly dangerous because it undermines the fundamental assumption that authentication implies appropriate authorization levels within the application logic.
The operational impact of this flaw is severe, as it potentially allows any remote actor with network access to gain administrative control over the Bank Locker Management System. By exploiting this improper access control mechanism, an attacker could bypass login screens or role-based restrictions entirely. This compromise leads to a complete loss of confidentiality and integrity for sensitive banking data managed by the system, including customer personal information, locker assignment details, transaction histories, and internal operational configurations. Furthermore, with administrative privileges obtained through this flaw, attackers may execute arbitrary code, modify database records, deface web pages, or use the compromised server as a pivot point for further attacks against other systems within the organization's network infrastructure.
The fact that an exploit has been publicly released significantly increases the risk landscape associated with this vulnerability. Publicly available exploits lower the barrier to entry for malicious actors who may lack sophisticated technical skills but can leverage existing tools to compromise vulnerable instances rapidly. This situation necessitates immediate remediation efforts from system administrators and developers responsible for maintaining PHPGurukul deployments. Mitigation strategies should include implementing strict server-side validation of all user roles against a trusted source such as the database or session store rather than relying on client-supplied parameters. Additionally, applying principle of least privilege to application functions ensures that even if input manipulation occurs, the impact is contained. Regular security audits and penetration testing are recommended to identify similar flaws in other components before they can be exploited by adversaries leveraging ATT&CK techniques related to initial access or privilege escalation.