CVE-2005-3849 in PmWiki
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Search module in PmWiki up to 2.0.12 allows remote attackers to inject arbitrary web script or HTML via the q parameter.
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Analysis
by VulDB Data Team • 10/27/2025
The CVE-2005-3849 vulnerability represents a critical cross-site scripting flaw within the Search module of PmWiki versions up to 2.0.12. This vulnerability stems from insufficient input validation and output encoding mechanisms within the application's search functionality, specifically when processing the q parameter. The flaw allows remote attackers to inject malicious scripts or HTML content that can be executed in the context of other users' browsers who access the compromised search results. This type of vulnerability falls under CWE-79 which categorizes improper neutralization of input during web page generation, making it a classic example of a client-side injection attack vector.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious payload containing script code and submits it through the q parameter of the search module. When the vulnerable application processes this input without proper sanitization, it directly incorporates the malicious content into the generated web page output. Upon subsequent access by other users, the injected scripts execute in their browser context, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability's impact is amplified by the fact that search functionality is typically accessible to all users, making it a prime target for exploitation.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable sophisticated attack chains within web application environments. Attackers can leverage the XSS flaw to steal user sessions, modify content, redirect users to phishing sites, or even perform actions on behalf of authenticated users through techniques such as CSRF (Cross-Site Request Forgery) exploitation. From an ATT&CK framework perspective, this vulnerability maps to T1566 (Phishing) and T1059 (Command and Scripting Interpreter) where the initial compromise occurs through the search interface and subsequent execution happens through browser-based scripting. The vulnerability also aligns with T1190 (Exploit Public-Facing Application) as it represents an unauthenticated attack vector targeting a publicly accessible web application feature.
Mitigation strategies for CVE-2005-3849 should prioritize immediate application updates to versions that address the input validation issues within the search module. Organizations should implement proper input sanitization techniques including HTML entity encoding, strict parameter validation, and output escaping for all user-supplied content. Additionally, implementing Content Security Policy (CSP) headers can provide defense-in-depth measures to prevent execution of unauthorized scripts even if the vulnerability is exploited. Network-level protections such as web application firewalls can also detect and block malicious payloads targeting the q parameter. The vulnerability highlights the critical importance of input validation across all application modules and demonstrates how seemingly benign features like search functionality can become attack vectors when proper security controls are not implemented. Security teams should conduct comprehensive vulnerability assessments to identify similar issues in other application components and establish secure coding practices that prevent injection flaws across the entire application stack.