CVE-2025-43865

React Router allows pre-render data spoofing on React-Router framework mode

Description

React Router is a router for React. In versions on the 7.0 branch prior to version 7.5.2, it's possible to modify pre-rendered data by adding a header to the request. This allows to completely spoof its contents and modify all the values of the data object passed to the HTML. This issue has been patched in version 7.5.2.

References

Link	Tags
https://github.com/remix-run/react-router/security/advisories/GHSA-cpj6-fhp6-mr6j
https://github.com/remix-run/react-router/commit/c84302972a152d851cf5dd859ff332b354b70111
https://github.com/remix-run/react-router/blob/e6c53a0130559b4a9bd47f9cf76ea5b08a69868a/packages/react-router/lib/server-runtime/routes.ts#L87

Frequently Asked Questions

What is the severity of CVE-2025-43865?: CVE-2025-43865 has been scored as a high severity vulnerability.
How to fix CVE-2025-43865?: To fix CVE-2025-43865, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-43865 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-43865 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-43865?: CVE-2025-43865 affects remix-run react-router.

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Description

Category

CWE-345 – Insufficient Verification of Data Authenticity

References

Frequently Asked Questions