Insufficient Verification of Data Authenticity Affecting @react-router/dev package, versions >=7.0.0 <7.5.2
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-REACTROUTERDEV-9804427
- published25 Apr 2025
- disclosed24 Apr 2025
- creditRachid Allam, Yasser Allam
Introduced: 24 Apr 2025
CVE-2025-43865 (opens in a new tab)How to fix?
Upgrade @react-router/dev to version 7.5.2 or higher.
Overview
@react-router/dev is a Dev tools and CLI for React Router
Affected versions of this package are vulnerable to Insufficient Verification of Data Authenticity through the X-React-Router-Prerender-Data header. An attacker can manipulate the pre-rendered data by injecting a malicious JSON object into this header, potentially leading to data spoofing and cache poisoning.
Note:
This is only exploitable if the application is running in Framework mode, which is the default configuration, it has a caching system in place and the target page utilizes a loader.