CVE-2013-7452 in Node.js
Summary
by MITRE
The validator module before 1.1.0 for Node.js allows remote attackers to bypass the cross-site scripting (XSS) filter via a crafted javascript URI.
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Analysis
by VulDB Data Team • 05/14/2026
The vulnerability identified as CVE-2013-7452 affects the validator module in Node.js versions prior to 1.1.0, representing a critical security flaw that undermines the application's ability to prevent cross-site scripting attacks. This issue stems from insufficient validation of javascript URIs within the module's filtering mechanisms, creating a pathway for malicious actors to circumvent intended security protections. The vulnerability specifically targets the XSS filter implementation, which is designed to sanitize user input and prevent the execution of malicious scripts in web applications.
The technical flaw manifests in the validator module's inadequate handling of javascript URIs that contain encoded or obfuscated payloads. Attackers can craft malicious URIs that appear to be legitimate javascript references but contain hidden malicious code or bypass the validation logic entirely. This occurs because the validation process fails to properly decode or analyze javascript URI schemes that include special characters, encoding sequences, or alternative representations that should trigger security alerts. The vulnerability operates at the input sanitization layer, where properly crafted malicious input can slip through validation checks that should have blocked it.
The operational impact of this vulnerability extends beyond simple XSS exploitation, as it allows attackers to execute arbitrary scripts in the context of vulnerable web applications. This can lead to session hijacking, data theft, privilege escalation, and complete compromise of user sessions. The attack vector is particularly concerning because it leverages the trust placed in the validation module, making it difficult for defenders to detect malicious activity. The vulnerability affects applications that rely on the validator module for input sanitization, potentially exposing thousands of web applications to remote code execution and data breaches.
Security professionals should implement immediate mitigation strategies including updating to validator module version 1.1.0 or later, which contains the necessary fixes for javascript URI validation. Organizations must also conduct thorough code reviews to identify any custom implementations that might be vulnerable to similar issues, as the flaw could exist in custom validation logic that mirrors the original vulnerability patterns. Additionally, implementing additional security layers such as content security policies and web application firewalls can provide defense-in-depth measures to protect against exploitation attempts.
This vulnerability aligns with CWE-79, which describes cross-site scripting flaws in web applications, and represents a classic case of insufficient input validation. From an ATT&CK framework perspective, this issue maps to T1059.007 for scripting languages and T1566 for social engineering techniques that could leverage the XSS capability. The vulnerability demonstrates the importance of comprehensive validation of URI schemes and the need for robust encoding handling in security modules, as it shows how seemingly minor implementation gaps can create significant security risks. Organizations should prioritize patch management and security testing to ensure all validation components properly handle encoded and obfuscated input patterns that could be used to bypass security controls.