CVE-2025-43865
React Router allows pre-render data spoofing on React-Router framework mode
- Published
- Apr 25, 2025
- Updated
- Apr 25, 2025
- Assigning CNA
- GitHub_M
- Evidence observed
- Aug 4, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:HLow · next 30 days
- Percentile
- 54.6%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1Proof-of-concept exploit for CVE-2025-43865 demonstrating pre-render data spoofing in React Router framework mode, enabling data injection during server-side rendering.
Responsible use
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