CVE-2026-53571

EIP tracks 1 public exploit for CVE-2026-53571. PoCs published by TazmiDev.

AI-analyzed exploit summary This PoC demonstrates a server.fs.deny bypass vulnerability in Vite.js on Windows systems, allowing unauthorized access to sensitive files (e.g., .env) via alternate data streams (::$DATA). The exploit sends a crafted HTTP request to retrieve file contents despite deny rules.

Vite is a frontend tooling framework for JavaScript. Prior to 8.0.16, 7.3.5, and 6.4.3, the contents of files that are specified by server.fs.deny can be returned to the browser on Windows. 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. This vulnerability is fixed in 8.0.16, 7.3.5, and 6.4.3.