Vulnerability Description
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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Vitejs | Vite | >= 6.0.0, <= 6.4.1 |
| Voidzero | Vite\+ | <= 0.1.15 |
Related Weaknesses (CWE)
References
- https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583ExploitVendor Advisory
- https://github.com/vitejs/vite/security/advisories/GHSA-p9ff-h696-f583ExploitVendor Advisory
FAQ
What is CVE-2026-39363?
CVE-2026-39363 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2026-39363?
CVE-2026-39363 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-39363?
Check the references section above for vendor advisories and patch information. Affected products include: Vitejs Vite, Voidzero Vite\+.