CVE-2026-39363
HighCVSS 7.5Exploitation Probability (EPSS)
High risk88th percentile - higher than 88% of all known CVEs
Summary
A vulnerability in Vite (a frontend tooling framework for JavaScript) from 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5 allows an attacker who can connect to the Vite dev server's WebSocket without an Origin header to invoke fetchModule via the vite:invoke event and read arbitrary files on the server as a JavaScript string. HTTP access controls are not applied to this WebSocket channel.
Risk Assessment
An attacker can read arbitrary files on the dev server, including configuration and source files, potentially leading to disclosure of sensitive data.
Recommendation
Update Vite to version 6.4.2, 7.3.2, or 8.0.5 (depending on your major version).
Other vulnerabilities in Vite
See all- CVE-2026-53571High
Vite is a frontend tooling framework for JavaScript that, prior to versions 8.0.16, 7.3.5, and 6.4.3, could return the contents of files specified by server.fs.deny to the browser on Windows. Issues with NTFS ADS path normalization allowed unauthorized access to sensitive files.
- CVE-2026-39365Medium
Vite, a frontend tooling framework for JavaScript, versions 6.0.0 to before 6.4.2, 7.3.2, and 8.0.5, has a vulnerability in handling .map requests for optimized dependencies. The dev server resolves file paths and calls readFile without restricting ../ segments in the URL, allowing bypass of the server.fs.strict allow list and retrieval of .map files outside the project root if they can be parsed as valid source map JSON.
- CVE-2026-39364High
Vite versions 7.1.0 to before 7.3.2 and 8.0.5 allow bypassing server.fs.deny restrictions. Files like .env or *.crt can be retrieved with HTTP 200 by appending query parameters ?raw, ?import&raw, or ?import&url&inline.
- CVE-2023-34092High
Vite, a frontend tooling, has a vulnerability that allows bypassing server options (`server.fs.deny`) using double forward-slash (//). This enables unauthenticated users to read files from the Vite application's root path, including default `fs.deny` settings.
Original NVD description (English source)
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.