CVE-2006-0877 in Easy Forum
Summary
by MITRE
Cross-site scripting vulnerability in Easy Forum 2.5 allows remote attackers to inject arbitrary web script or HTML via the image variable.
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Analysis
by VulDB Data Team • 10/17/2025
The vulnerability described in CVE-2006-0877 represents a classic cross-site scripting flaw within the Easy Forum 2.5 web application, specifically targeting the image variable parameter. This type of vulnerability falls under the broader category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security that allows malicious actors to inject client-side scripts into web pages viewed by other users. The flaw exists in the application's input validation mechanisms, where user-supplied data is not properly sanitized before being rendered back to end users through web browsers.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious payload containing HTML or JavaScript code and submits it through the image variable parameter of the Easy Forum 2.5 application. When the application processes this input without adequate sanitization, the malicious script gets embedded into the forum's web pages and executed within the context of other users' browsers who view the affected content. This creates a persistent XSS vector that can be leveraged for various malicious activities including session hijacking, credential theft, and redirection to malicious websites. The vulnerability specifically affects the application's handling of image-related parameters, suggesting that the flaw may be present in how the forum processes image upload or display functionality.
From an operational perspective, this vulnerability poses significant risks to both end users and administrators of the Easy Forum 2.5 platform. Users who browse forums containing malicious content could have their browser sessions compromised, potentially leading to unauthorized access to their accounts, data exfiltration, and further propagation of attacks within the forum ecosystem. The impact extends beyond individual user compromise as the vulnerability can be used to deface forum content, inject malicious advertisements, or create backdoor access points for more sophisticated attacks. The persistence of the vulnerability means that once exploited, the malicious scripts continue to execute for all users who view the affected pages until the forum administrators implement proper fixes.
The mitigation strategies for CVE-2006-0877 should focus on implementing robust input validation and output encoding mechanisms throughout the Easy Forum 2.5 application. This includes sanitizing all user inputs, particularly those related to image parameters, by removing or encoding potentially dangerous characters such as angle brackets, script tags, and event handlers. The application should employ proper HTML escaping techniques when rendering user-supplied content to prevent script execution in browser contexts. Additionally, implementing content security policies and using secure coding practices that align with OWASP Top Ten recommendations would significantly reduce the risk of similar vulnerabilities. Organizations should also consider deploying web application firewalls and regular security audits to detect and prevent exploitation attempts. The vulnerability demonstrates the importance of the principle of least privilege in web application design, where user inputs are treated as untrusted and validated before any processing or rendering occurs, aligning with defensive programming practices recommended in the ATT&CK framework for preventing client-side exploitation techniques.