CVE-2006-5299 in Gcontact
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in index.php in Gcontact 0.6.5 allow remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 04/24/2026
The vulnerability identified as CVE-2006-5299 represents a critical security flaw in the Gcontact 0.6.5 web application that exposes users to cross-site scripting attacks. This vulnerability specifically affects the index.php file within the application's codebase, making it a prime target for malicious actors seeking to exploit web application weaknesses. The presence of multiple XSS vulnerabilities within a single file indicates a fundamental flaw in input validation and output sanitization practices, suggesting that the application fails to properly handle user-supplied data before rendering it in web responses.
The technical nature of this vulnerability stems from inadequate sanitization of user inputs that flow into the application's response generation process. When users interact with the Gcontact application through the index.php interface, malicious actors can inject arbitrary web scripts or HTML content through unspecified vectors that bypass the application's security controls. This weakness allows attackers to execute malicious code within the context of other users' browsers, potentially leading to session hijacking, credential theft, or further compromise of the affected systems. The vulnerability operates at the application layer and specifically targets the web interface, making it particularly dangerous in environments where users trust the application's legitimacy.
From an operational impact perspective, this vulnerability creates significant risks for organizations using Gcontact 0.6.5, as it enables attackers to manipulate the application's behavior and potentially gain unauthorized access to sensitive information. The remote exploitation capability means that attackers do not need physical access to the system or network to launch attacks, making the vulnerability particularly dangerous in public-facing web applications. Users who interact with the compromised application may unknowingly execute malicious scripts that can steal cookies, redirect them to phishing sites, or perform actions on their behalf without their knowledge, effectively compromising the integrity of user sessions and potentially leading to broader security breaches.
The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and it maps to several ATT&CK techniques including T1566 for social engineering attacks and T1059 for command and script injection. Organizations should implement comprehensive input validation mechanisms and output encoding to prevent such vulnerabilities from being exploited. The recommended mitigations include implementing proper sanitization of all user inputs, employing Content Security Policy headers, and upgrading to a patched version of Gcontact. Additionally, regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other components of the web application stack. The vulnerability serves as a reminder of the critical importance of secure coding practices and the necessity of validating all user-supplied data before it is processed or rendered in web responses.