CVE-2024-49664 in chatplusjp Plugin
Summary
by MITRE • 10/29/2024
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in chatplusjp chatplusjp chatplusjp allows Reflected XSS.This issue affects chatplusjp: from n/a through <= 1.02.
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Analysis
by VulDB Data Team • 04/07/2026
The vulnerability identified as CVE-2024-49664 represents a critical cross-site scripting flaw within the chatplusjp web application that enables attackers to execute malicious scripts in the context of victim browsers. This reflected XSS vulnerability occurs during the web page generation process when the application fails to properly sanitize user input before incorporating it into dynamic web content. The flaw exists in the chatplusjp application version 1.02 and earlier, indicating that all versions within this range are potentially compromised. The vulnerability stems from the application's improper neutralization of input data, allowing malicious payloads to be injected and executed when users view affected web pages. This type of vulnerability falls under CWE-79 which specifically addresses cross-site scripting issues in web applications where input validation and output encoding mechanisms are insufficient to prevent script injection attacks.
The operational impact of this vulnerability is significant as it allows attackers to perform a variety of malicious activities including session hijacking, credential theft, and redirection to malicious websites. An attacker could craft a specially crafted URL containing malicious JavaScript code that, when visited by a victim, would execute the script within the victim's browser context. This reflected nature of the vulnerability means that the malicious input is reflected back to the user through the web application's response without proper sanitization, making it particularly dangerous for web applications that process user input directly in their responses. The vulnerability could be exploited through various vectors including email links, instant messaging, or social engineering tactics that encourage users to click on malicious URLs. According to ATT&CK framework, this vulnerability maps to T1566 which covers social engineering techniques, and T1190 which addresses exploitation of vulnerabilities in web applications.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application's codebase. The most effective approach involves sanitizing all user-supplied input before it is processed or displayed in web pages, ensuring that any potentially dangerous characters or script tags are properly escaped or removed. Implementing Content Security Policy headers can provide additional protection layers by restricting the sources from which scripts can be loaded. Regular security code reviews and automated vulnerability scanning should be integrated into the development lifecycle to identify similar issues before they can be exploited. The application should also implement proper HTTP headers including X-Content-Type-Options and X-Frame-Options to prevent certain types of attacks. Organizations should consider implementing Web Application Firewall rules that can detect and block known XSS attack patterns, while also ensuring that all users are running the latest version of the chatplusjp application that contains the necessary patches. Additionally, user education regarding suspicious links and the importance of verifying website authenticity can help reduce the success rate of exploitation attempts. The vulnerability requires immediate attention as reflected XSS issues can be exploited quickly and with minimal technical expertise, making them particularly attractive to threat actors seeking to compromise user sessions or steal sensitive information.