CVE-2006-0857 in Chatbox Plugin
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Chatbox Plugin 1.0 in e107 0.7.2 allows remote attackers to inject arbitrary HTML or web script via a Chatbox, as demonstrated using a SCRIPT element.
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Analysis
by VulDB Data Team • 10/16/2025
The vulnerability described in CVE-2006-0857 represents a classic cross-site scripting flaw that existed within the Chatbox Plugin version 1.0 of the e107 content management system. This particular weakness allowed remote attackers to inject malicious code through the chatbox functionality, creating a significant security risk for websites utilizing this specific plugin version. The vulnerability specifically targeted the input handling mechanisms within the chatbox component, where user-submitted content was not properly sanitized before being rendered back to other users. The attack vector was demonstrated using SCRIPT elements, which are particularly dangerous in XSS contexts as they can execute arbitrary JavaScript code within the victim's browser environment. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and well-documented web application security flaws in the industry.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the e107 platform's chatbox plugin. When users submitted messages through the chatbox interface, the system failed to properly escape or filter special HTML characters and script tags that could be embedded within the user input. This lack of proper sanitization meant that any malicious payload containing script tags would be executed directly in the browser context of other users who viewed the chatbox content. The vulnerability was particularly concerning because it allowed attackers to inject not just simple HTML but full JavaScript code that could perform various malicious activities such as cookie theft, redirection to malicious sites, or even defacement of the affected website. The attack could be executed without requiring any authentication or privileged access, making it particularly dangerous for public-facing web applications.
The operational impact of this vulnerability was substantial as it could compromise the security of entire websites that relied on the affected plugin. When exploited, the XSS flaw could lead to session hijacking, where attackers could steal user authentication cookies and impersonate legitimate users. Additionally, the vulnerability could be used to deface websites by injecting malicious content that would be displayed to all users accessing the chatbox functionality. The attack could also be leveraged to redirect users to phishing sites or to perform other malicious activities that could harm both the website owners and their visitors. From an attacker's perspective, this vulnerability provided a persistent means of compromising user sessions and could be combined with other techniques to create more sophisticated attacks. The vulnerability also demonstrated the importance of proper input validation across all user-facing components of web applications, as even seemingly innocuous features like chatboxes could become attack vectors.
The recommended mitigations for this vulnerability involve implementing proper input sanitization and output encoding techniques throughout the application. The most effective approach would be to ensure that all user-submitted content is properly escaped before being rendered back to other users, particularly when displaying content in HTML contexts. This aligns with the defensive programming principles outlined in the OWASP Top Ten and the CWE guidelines for preventing XSS vulnerabilities. Organizations should implement Content Security Policy headers to limit the execution of inline scripts and ensure that the application follows secure coding practices. The specific fix would involve updating the Chatbox Plugin to properly sanitize user inputs or upgrading to a newer version of e107 that addresses this vulnerability. Additionally, regular security audits and input validation testing should be conducted to identify similar vulnerabilities in other components of the web application. The ATT&CK framework would classify this vulnerability under the T1059.007 technique for Scripting, specifically targeting the execution of malicious scripts in web browsers through XSS vectors. This vulnerability also highlights the critical need for maintaining up-to-date software versions and implementing proper security controls throughout the application lifecycle to prevent such persistent security flaws from compromising web applications.