CVE-2006-5146 in Yblog
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Yblog allow remote attackers to inject arbitrary web script or HTML via the (1) id parameter in (a) funk.php, or the (2) action parameter in (b) tem.php and (c) uss.php.
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Analysis
by VulDB Data Team • 04/23/2026
The vulnerability identified as CVE-2006-5146 represents a critical cross-site scripting flaw affecting the Yblog content management system. This vulnerability falls under the Common Weakness Enumeration category CWE-79 which specifically addresses improper neutralization of input during web page generation, making it a classic example of insecure web application development practices. The flaw exists in multiple files within the Yblog system, specifically targeting the funk.php, tem.php, and uss.php scripts where user-supplied input is not properly sanitized before being rendered in web responses.
The technical implementation of this vulnerability occurs through the manipulation of HTTP request parameters that are directly incorporated into HTML output without adequate validation or encoding. Attackers can exploit the id parameter in funk.php and the action parameter in both tem.php and uss.php to inject malicious JavaScript code or HTML content. When these parameters are processed by the vulnerable scripts and subsequently displayed to other users, the injected code executes in the context of the victim's browser session, creating a persistent cross-site scripting attack vector. This allows attackers to perform actions on behalf of users, steal session cookies, or redirect users to malicious websites.
The operational impact of this vulnerability is significant as it enables remote code execution capabilities through browser-based attacks. An attacker can craft malicious URLs containing script payloads that, when visited by unsuspecting users, will execute in their browser environment. This creates a persistent threat where users who access compromised pages become unwitting participants in the attack chain. The vulnerability affects the integrity and confidentiality of user data, potentially allowing attackers to access sensitive information, modify content, or establish backdoor access points within the affected web application. The attack surface is broad as it impacts multiple files within the application's core functionality, increasing the likelihood of successful exploitation.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user-supplied input through proper parameter validation and HTML encoding before any content is rendered to users. Organizations should implement Content Security Policy headers to prevent unauthorized script execution and utilize web application firewalls to detect and block malicious payloads. Additionally, regular security audits and code reviews should be conducted to identify similar vulnerabilities in other application components. The remediation process requires updating the affected scripts to properly escape or validate input parameters, with the specific implementation involving the use of functions that encode special HTML characters and validate parameter values against expected formats. This vulnerability exemplifies the importance of secure coding practices and demonstrates how seemingly simple parameter handling can create significant security risks when proper sanitization measures are not implemented. The attack patterns associated with this vulnerability align with ATT&CK technique T1566 which covers spearphishing attachments and links, making it a critical concern for organizations relying on web-based content management systems.