CVE-2024-53262 in kit
Summary
by MITRE • 11/25/2024
SvelteKit is a framework for rapidly developing robust, performant web applications using Svelte. The static error.html template for errors contains placeholders that are replaced without escaping the content first. error.html is the page that is rendered when everything else fails. It can contain the following placeholders: %sveltekit.status% — the HTTP status, and %sveltekit.error.message% — the error message. This leads to possible injection if an app explicitly creates an error with a message that contains user controlled content. Only applications where user provided input is used in the `Error` message will be vulnerable, so the vast majority of applications will not be vulnerable This issue has been addressed in version 2.8.3 and all users are advised to upgrade. There are no known workarounds for this vulnerability.
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Analysis
by VulDB Data Team • 08/28/2025
The vulnerability identified as CVE-2024-53262 affects SvelteKit, a modern web application framework that enables rapid development of robust and performant applications using the Svelte frontend library. This security flaw resides within the framework's error handling mechanism, specifically in the static error.html template that serves as a fallback page when application errors occur. The template contains two placeholders %sveltekit.status% and %sveltekit.error.message% that are intended to display HTTP status codes and error messages respectively. The vulnerability arises from the absence of proper content sanitization or escaping before these placeholders are replaced with actual values during error rendering.
The technical implementation of this vulnerability stems from improper input validation and output encoding practices within SvelteKit's error handling pipeline. When applications create error objects that incorporate user-controlled input directly into the error message, the framework fails to escape special characters that could be interpreted as markup or scripting elements. This creates a potential injection vector where maliciously crafted error messages could contain HTML, JavaScript, or other executable content that gets rendered directly into the error template without proper sanitization. The vulnerability is particularly concerning because the error.html template serves as a last-resort page when other application components fail, making it a critical component in the application's security posture.
The operational impact of CVE-2024-53262 extends beyond traditional cross-site scripting vulnerabilities, as it represents a server-side template injection risk that could potentially enable attackers to execute arbitrary code or manipulate the error display mechanism. According to CWE-79, which addresses Cross-Site Scripting vulnerabilities, this flaw allows for unauthorized modification of the user's view of the web application, potentially leading to session hijacking, data theft, or further exploitation of the application. The ATT&CK framework's T1211 technique for exploitation of vulnerabilities through injection attacks applies directly to this scenario, as the flaw enables attackers to inject malicious content through error message parameters. The vulnerability's impact is mitigated by the requirement for explicit user input in error messages, meaning applications that do not incorporate user-provided content into their error handling mechanisms remain unaffected.
Organizations using SvelteKit versions prior to 2.8.3 face significant security risks, as the vulnerability could be exploited by attackers who can manipulate error messages through user input channels such as API endpoints, form submissions, or other application interfaces that might generate error conditions. The fix implemented in version 2.8.3 addresses the core issue by ensuring proper escaping and sanitization of error message content before template substitution occurs. This remediation follows security best practices outlined in OWASP's secure coding guidelines for preventing injection vulnerabilities and aligns with the principle of defense in depth by implementing proper input validation at multiple layers of the application architecture. The lack of known workarounds for this vulnerability underscores the importance of immediate upgrade to the patched version, as alternative mitigation strategies would be insufficient to address the root cause of the template injection flaw.