CVE-2026-39363
Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket
- Published
- Apr 7, 2026
- Updated
- Aug 25, 2026
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 24, 2026
Primary CVSS
nvd · CVSS 4.0
CVSS: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:XLow · next 30 days
- Percentile
- 85.2%
- Model date
- Oct 17, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
vite/CVE-2026-39363
Vite Development Server WebSocket Arbitrary File Read (CVE-2026-39363)
Vulhub vulnerability labsDeclared conditions
- lab image version: vulhub/vite:7.3.1(vite/CVE-2026-39363/docker-compose.yml:services.web.image)
javascript/cves/2026/CVE-2026-39363.yaml
Nuclei TemplatesDeclared conditions
- verification: regex,word($.matchers[*].type)
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