CVE-2025-43864

React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. This issue has been patched in version 7.5.2.

React Router is a router for React. Starting in version 7.2.0 and prior to version 7.5.2, it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. This issue has been patched in version 7.5.2.

## Summary After some research, it turns out that it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. ## Details The vulnerable header is `X-React-Router-SPA-Mode`; adding it to a request sent to a page/endpoint using a loader throws an error. Here is [the vulnerable code](https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/server.ts#L407) : <img width="672" alt="Capture d’écran 2025-04-07 à 08 28 20" src="https://github.com/user-attachments/assets/0a0e9c41-70fd-4dba-9061-892dd6797291" /> To use the header, React-router must be used in Framework mode, and for the attack to be possible the target page must use a loader. ## Steps to reproduce Versions used for our PoC: - "@react-router/node": "^7.5.0", - "@react-router/serve": "^7.5.0", - "react": "^19.0.0" - "react-dom": "^19.0.0" - "react-router": "^7.5.0" 1. Install React-Router with its default configuration in Framework mode (https://reactrouter.com/start/framework/installation) 2. Add a simple page using a loader (example: `routes/ssr`)  3. Send a request to the endpoint using the loader (`/ssr` in our case) adding the following header: ``` X-React-Router-SPA-Mode: yes ``` Notice the difference between a request with and without the header; **Normal request**  **With the header**   ## Impact If a system cache is in place, it is possible to poison the response by completely altering its content (*by an error message*), strongly impacting its availability, making the latter impractical via a cache-poisoning attack. ## Credits - Rachid Allam (zhero;) - Yasser Allam (inzo_)

## Summary After some research, it turns out that it is possible to force an application to switch to SPA mode by adding a header to the request. If the application uses SSR and is forced to switch to SPA, this causes an error that completely corrupts the page. If a cache system is in place, this allows the response containing the error to be cached, resulting in a cache poisoning that strongly impacts the availability of the application. ## Details The vulnerable header is `X-React-Router-SPA-Mode`; adding it to a request sent to a page/endpoint using a loader throws an error. Here is [the vulnerable code](https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/server.ts#L407) : <img width="672" alt="Capture d’écran 2025-04-07 à 08 28 20" src="https://github.com/user-attachments/assets/0a0e9c41-70fd-4dba-9061-892dd6797291" /> To use the header, React-router must be used in Framework mode, and for the attack to be possible the target page must use a loader. ## Steps to reproduce Versions used for our PoC: - "@react-router/node": "^7.5.0", - "@react-router/serve": "^7.5.0", - "react": "^19.0.0" - "react-dom": "^19.0.0" - "react-router": "^7.5.0" 1. Install React-Router with its default configuration in Framework mode (https://reactrouter.com/start/framework/installation) 2. Add a simple page using a loader (example: `routes/ssr`)  3. Send a request to the endpoint using the loader (`/ssr` in our case) adding the following header: ``` X-React-Router-SPA-Mode: yes ``` Notice the difference between a request with and without the header; **Normal request**  **With the header**   ## Impact If a system cache is in place, it is possible to poison the response by completely altering its content (*by an error message*), strongly impacting its availability, making the latter impractical via a cache-poisoning attack. ## Credits - Rachid Allam (zhero;) - Yasser Allam (inzo_)

React Router es un enrutador para React. A partir de la versión 7.2.0 y anteriores a la 7.5.2, es posible forzar el cambio a modo SPA en una aplicación añadiendo un encabezado a la solicitud. Si la aplicación usa SSR y se ve obligada a cambiar a modo SPA, se produce un error que corrompe completamente la página. Si existe un sistema de caché, la respuesta con el error se almacena en caché, lo que provoca un envenenamiento de caché que afecta gravemente la disponibilidad de la aplicación. Este problema se ha corregido en la versión 7.5.2.