CVE-2026-39363

Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket

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.

Affected

vitejs · vite · vite-plus

CVSS v4.0 GITHUB

8.2 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v4.0 GitHub

8.2 HIGHCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

2.62% chance of exploitation in the next 30 days, 85th percentile

Nuclei

high

Published

2026-04-07

Updated

2026-08-25

Proof-of-concept exploits (3)

• advisories/GHSA-p9ff-h696-f583
• f4s1on/CVE-2026-393630★ · 2026-05-06
• sunynov/CVE-2026-393630★ · 2026-08-04

Nuclei templates (1)

• projectdiscovery/nuclei-templates/blob/main/javascript/cves/2026/CVE-2026-39363.yaml

Vulhub environments (1)

• vulhub/vulhub/tree/master/vite/CVE-2026-39363

Security advisories

• vitejs/vite/security/advisories/GHSA-p9ff-h696-f583

References

• CVE Record
• NVD entry