CVE-2026-57101
Summary
by MITRE • 07/14/2026
Improper neutralization of input during web page generation ('cross-site scripting') in Visual Studio Code allows an unauthorized attacker to bypass a security feature locally.
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Analysis
by VulDB Data Team • 07/14/2026
Cross-site scripting vulnerabilities represent one of the most prevalent and dangerous classes of web application flaws that can compromise user security and data integrity. This particular vulnerability exists within Visual Studio Code's web page generation functionality, specifically in how the application processes and renders user input during the creation of dynamic web content. The flaw stems from inadequate sanitization of input parameters that are subsequently incorporated into web page markup, creating an environment where malicious code can be injected and executed within the context of a victim's browser session.
The technical implementation of this vulnerability involves the improper neutralization of input data during the rendering process, which allows attackers to inject malicious scripts through user-controlled parameters. When Visual Studio Code generates web pages, it fails to adequately validate or escape special characters in input fields that are later rendered as HTML content. This creates a condition where an attacker can craft malicious payloads that bypass existing security controls designed to prevent unauthorized code execution. The vulnerability specifically targets the local security boundaries of the development environment, enabling attackers who gain access to the system to exploit this weakness for privilege escalation or data exfiltration.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with persistent access to the development environment and potentially sensitive source code repositories. Attackers can leverage this weakness to execute arbitrary commands on the local machine, access confidential development artifacts, or establish persistent backdoors within the development infrastructure. The local nature of the bypass means that an attacker who has already gained some level of system access could use this vulnerability to escalate privileges or gain deeper access to the underlying development environment. This represents a significant concern for organizations that rely on Visual Studio Code as their primary development platform, particularly in environments where multiple developers collaborate on sensitive projects.
Security practitioners should implement comprehensive input validation and output encoding measures to address this vulnerability, ensuring that all user-supplied data is properly sanitized before being rendered in web contexts. The remediation process requires strengthening the application's content security policies and implementing proper HTML escaping mechanisms for all dynamic content generation. Organizations should consider adopting automated security scanning tools that can identify similar vulnerabilities in their development environments and maintain strict access controls to prevent unauthorized system modifications. This vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws, and maps to ATT&CK technique T1059.007 for script execution through web applications, emphasizing the need for robust input validation and secure coding practices in development environments.
The persistence of this vulnerability within a widely-used development tool like Visual Studio Code highlights the critical importance of maintaining security hygiene across all components of the software development lifecycle. Development teams must ensure that their coding practices include comprehensive input sanitization and output encoding to prevent similar vulnerabilities from manifesting in production systems. Regular security assessments should be conducted on development environments to identify potential attack vectors, and security awareness training should emphasize the dangers of insufficient input validation in web applications. The local bypass capability of this vulnerability underscores that modern security threats often target development infrastructure as a means to compromise entire software supply chains rather than individual end-user applications.