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CVE-2026-39363— Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket

Quick assessment

Affected
vitejs vite
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vite是Vite开源的一种新型的前端构建工具。 Vite 6.0.0至6.4.2之前版本、7.3.2之前版本和8.0.5之前版本存在访问控制错误漏洞，该漏洞源于WebSocket路径缺少访问控制，可能导致攻击者检索服务器上的任意文件。

CVSS 8.2 · High EPSS 2.62% · P85

Affected Version Matrix 4

VendorProduct Version RangeStatus
vitejs vite >= 8.0.0, < 8.0.5 affected
>= 7.0.0, < 7.3.2 affected
>= 6.0.0, < 6.4.2 affected
vitejs vite-plus < 0.1.16 affected
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I. Basic Information for CVE-2026-39363

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Vite Affected by Arbitrary File Read via Vite Dev Server WebSocket
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Vite 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vite是Vite开源的一种新型的前端构建工具。 Vite 6.0.0至6.4.2之前版本、7.3.2之前版本和8.0.5之前版本存在访问控制错误漏洞，该漏洞源于WebSocket路径缺少访问控制，可能导致攻击者检索服务器上的任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vitejs vite >= 8.0.0, < 8.0.5 -
vitejs vite-plus < 0.1.16 -

II. Public POCs for CVE-2026-39363

# POC Description Source Link Shenlong Link
1 Vite dev server exposes the fetchModule method via its WebSocket HMR (Hot Module Replacement) endpoint using the vite-hmr sub-protocol. By connecting to the WebSocket endpoint and sending a crafted vite:invoke custom event that calls fetchModule with a file:// URL (e.g., file:///etc/passwd?raw), an attacker can bypass server.fs.deny restrictions and read arbitrary files from the server filesystem. The vulnerability exists because fetchModule does not enforce the same filesystem access controls as other Vite server endpoints. https://github.com/projectdiscovery/nuclei-templates/blob/main/javascript/cves/2026/CVE-2026-39363.yaml POC Details
2 https://github.com/vulhub/vulhub/blob/master/vite/CVE-2026-39363/README.md POC Details
3 None https://github.com/Threekiii/Awesome-POC/blob/master/%E5%BC%80%E5%8F%91%E6%A1%86%E6%9E%B6%E6%BC%8F%E6%B4%9E/Vite%20%E5%BC%80%E5%8F%91%E6%9C%8D%E5%8A%A1%E5%99%A8%20WebSocket%20%E4%BB%BB%E6%84%8F%E6%96%87%E4%BB%B6%E8%AF%BB%E5%8F%96%E6%BC%8F%E6%B4%9E%20CVE-2026-39363.md POC Details
AI-Generated POC Verified env Premium
Qwen3.6-35B-A3B · 7546 chars
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III. Intelligence Information for CVE-2026-39363

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Vendor Advisories for CVE-2026-39363 (1)

Same Patch Batch · vitejs · 2026-04-07 · 3 CVEs total

CVE-2026-39364 8.2 HIGH Vite has a `server.fs.deny` bypass with queries
CVE-2026-39365 Vite has a Path Traversal in Optimized Deps `.map` Handling

IV. Related Vulnerabilities

Same product: vite
Same vendor: vitejs
Same weakness: CWE-200

V. Comments for CVE-2026-39363

Anonymous User
2026-04-08 09:23:07

1

Anonymous User
2026-04-08 09:23:45

<script>alert(1)</script>

Anonymous User
2026-04-08 09:24:11

<scr<script>ipt>alert(1)</scr</script>ipt>

Anonymous User
2026-04-08 09:24:38

\u003cscript\u003ealert(1)\u003c/script\u003e

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