vitejs vite up to 6.4.1/7.3.1/8.0.4 HTTP Request information disclosure

Summaryinfo

A vulnerability identified as problematic has been detected in vitejs vite up to 6.4.1/7.3.1/8.0.4. This issue affects some unknown processing of the component HTTP Request Handler. The manipulation leads to information disclosure. This vulnerability is documented as CVE-2026-39363. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in vitejs vite up to 6.4.1/7.3.1/8.0.4. It has been rated as problematic. This issue affects some unknown functionality of the component HTTP Request Handler. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

Vite is a frontend tooling framework for JavaScript. From 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, if it is possible to connect to the Vite dev server’s WebSocket without an Origin header, an attacker can invoke fetchModule via the custom WebSocket event vite:invoke and combine file://... with ?raw (or ?inline) to retrieve the contents of arbitrary files on the server as a JavaScript string (e.g., export default "..."). The access control enforced in the HTTP request path (such as server.fs.allow) is not applied to this WebSocket-based execution path. This vulnerability is fixed in 6.4.2, 7.3.2, and 8.0.5.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-39363 since 04/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 6.4.2, 7.3.2 or 8.0.5 eliminates this vulnerability.

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Productinfo

Vendor

• vitejs

Name

• vite

Version

• 6.4.0
• 6.4.1
• 7.3.0
• 7.3.1
• 8.0.0
• 8.0.1
• 8.0.2
• 8.0.3
• 8.0.4

Website

• Product: https://github.com/vitejs/vite/

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