CVE-2023-38876 in PHP-Login-System
Summary
by MITRE • 09/21/2023
A reflected cross-site scripting (XSS) vulnerability in msaad1999's PHP-Login-System 2.0.1 allows remote attackers to execute arbitrary JavaScript in the web browser of a user, by including a malicious payload into the 'selector' parameter in '/reset-password'.
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Analysis
by VulDB Data Team • 01/20/2026
This reflected cross-site scripting vulnerability exists within the PHP-Login-System version 2.0.1 developed by msaad1999, representing a critical security flaw that enables remote attackers to inject malicious JavaScript code into web applications. The vulnerability specifically manifests when the application fails to properly sanitize or escape user input within the 'selector' parameter of the '/reset-password' endpoint. When a victim clicks on a maliciously crafted link containing the XSS payload, the system reflects the attacker-controlled input back to the user's browser without adequate validation or encoding, creating an execution environment for the malicious script.
The technical implementation of this vulnerability stems from the application's insufficient input validation mechanisms and improper output encoding practices. The 'selector' parameter serves as an entry point for attacker-controlled data that flows directly into the web application's response without proper sanitization. This flaw aligns with CWE-79 which defines cross-site scripting as the improper handling of untrusted data within a web application, and specifically maps to CWE-79.79.1 which addresses reflected XSS in web applications. The vulnerability operates through the standard XSS attack vector where malicious input is embedded in a URL parameter and executed when the victim's browser processes the response containing the reflected payload.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform various malicious activities within the victim's browser context. Attackers can leverage this vulnerability to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious websites, or even install malware through browser-based attacks. The reflected nature of this XSS means that the attack payload does not need to be stored on the server, making it particularly dangerous as it can be delivered through phishing emails, compromised websites, or social engineering campaigns. This vulnerability directly violates the principle of least privilege and can compromise the integrity of user sessions and the confidentiality of sensitive data.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and output encoding mechanisms throughout the application's codebase. The most effective immediate fix involves sanitizing all user-provided input through proper encoding functions such as htmlspecialchars() or similar mechanisms before incorporating any data into HTML output. Implementing Content Security Policy headers can provide an additional layer of protection by restricting script execution and limiting the sources from which scripts can be loaded. The application should also employ proper parameter validation and reject any input that contains potentially dangerous characters or patterns associated with XSS attacks. Security measures should include regular code reviews, automated input validation testing, and adherence to secure coding practices as outlined in the OWASP Top Ten and MITRE ATT&CK framework, particularly focusing on techniques related to command injection and script injection within web applications. Organizations should also implement proper logging and monitoring to detect potential exploitation attempts and establish incident response procedures for rapid remediation of such vulnerabilities.