🛡️ CVE-2026-53571 — vite

🟠 CVSS 8.0 — High ⚠️ Exploit Public CWE-200 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

vite: server.fs.deny bypass on Windows alternate paths

Summary

The contents of files that are specified by [server.fs.deny](https://vite.dev/config/server-options#server-fs-deny) can be returned to the browser on Windows.

Impact

Only apps that match the following conditions are affected:

  • explicitly exposes the Vite dev server to the network (using --host or [server.host config option](https://vitejs.dev/config/server-options.html#server-host))
  • the sensitive file exists in the allowed directories specified by [server.fs.allow](https://vite.dev/config/server-options#server-fs-allow)
  • either of:
  • the sensitive file exists in an NTFS volume
  • the dev server is running on Windows and the sensitive file exists in a volume that 8.3 short name generation is enabled (it is enabled by default on system volumes)

Details

Vite’s dev server denies direct access to sensitive files through server.fs.deny, including entries such as .env, .env.*, and *.{crt,pem}. However, on Windows, the deny logic does not correctly normalize NTFS ADS path forms before access checks are applied.

Because of this, requests such as /.env::$DATA?raw are treated as allowed paths, while Windows resolves them to the original file's default data stream.

Similar to that, Windows allows accessing a file using a different name with the 8.3 short name compatibility feature. Vite did not reject accessing files via them.

PoC

```bash

$ npm create vite@latest

$ cd vite-project/

$ npm install

$ npm run dev

```

Access via browser at http://localhost:5173/.env::$DATA?raw

<img width="388" height="129" alt="deecc1315123883cfd0f9c26a002845a" src="https://github.com/user-attachments/assets/895c6012-4e2e-4a35-babb-69bbf3ee7170" />

Example expected result:

  • /.env::$DATA?raw returns the contents of .env
  • /tls.pem::$DATA?raw returns the contents of tls.pem

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity none, availability none.

Weakness class

CVE-2026-53571 is classified as CWE-200: Exposure of Sensitive Information. Information that should stay internal is disclosed to someone who is not authorised to see it.

Affected software

CVE-2026-53571 is recorded against 3 packages.

  • vite
  • vite-plus
  • vite\+ (fixed in 0.1.24)

Timeline and source

Published on 15 June 2026 and last revised on 15 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Package)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE CWE-200
Public Exploit ⚠️ Yes
Source NVD
Published 2026-06-15
Updated 2026-08-12
Modified 2026-07-15
Fix URL N/A

Affected Packages

Software From version Fixed in
vite — —
vite-plus — —
vite\+ — 0.1.24

Similar Threats

Exploit Protection

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