Exploitation Summary
EIP tracks 3 public exploits for CVE-2025-61686. PoCs published by boroeurnprach, FlowerWitch, Kai-One001.
AI-analyzed exploit summary This PoC demonstrates a directory traversal vulnerability in a Node.js application using `@react-router/node`'s `createFileSessionStorage`. The exploit manipulates the session cookie to read arbitrary files (e.g., `/etc/passwd`) via path traversal, confirmed through JSON parsing errors.
Description
React Router is a router for React. In @react-router/node versions 7.0.0 through 7.9.3, @remix-run/deno prior to version 2.17.2, and @remix-run/node prior to version 2.17.2, if createFileSessionStorage() is being used from @react-router/node (or @remix-run/node/@remix-run/deno in Remix v2) with an unsigned cookie, it is possible for an attacker to cause the session to try to read/write from a location outside the specified session file directory. The success of the attack would depend on the permissions of the web server process to access those files. Read files cannot be returned directly to the attacker. Session file reads would only succeed if the file matched the expected session file format. If the file matched the session file format, the data would be populated into the server side session but not directly returned to the attacker unless the application logic returned specific session information. This issue has been patched in @react-router/node version 7.9.4, @remix-run/deno version 2.17.2, and @remix-run/node version 2.17.2.
Exploits (3)
This PoC demonstrates a directory traversal vulnerability in a Node.js application using `@react-router/node`'s `createFileSessionStorage`. The exploit manipulates the session cookie to read arbitrary files (e.g., `/etc/passwd`) via path traversal, confirmed through JSON parsing errors.
This repository contains a working proof-of-concept for CVE-2025-61686, demonstrating a directory traversal vulnerability in react-router's fileStorage session handling. The exploit leverages improper path sanitization to write arbitrary files via crafted session cookies.
This repository contains a working proof-of-concept for CVE-2025-61686, a path traversal vulnerability in React Router's file-based session storage. The exploit leverages unsigned cookies to manipulate session IDs, allowing arbitrary file read/write operations on the server.
References (1)
Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H