Answer in brief
CVE-2026-53663 records a Low severity (CVSS 3.1) vulnerability in React Router: Potential CSRF via PUT/PATCH/DELETE document requests. The current sources do not mark it as known exploited. The current feed maps react-router (npm), react-router (npm), @remix-run/server-runtime (npm), @remix-run/server-runtime (npm). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 3.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps react-router (npm), react-router (npm), @remix-run/server-runtime (npm), @remix-run/server-runtime (npm). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| react-routernpm | >=7.12.0,<7.15.1 | 7.15.1 |
| react-routernpm | >=7.12.0 <7.15.1 | 7.15.1 |
| @remix-run/server-runtimenpm | >=2.17.3,<2.17.5 | 2.17.5 |
| @remix-run/server-runtimenpm | >=2.17.3 <2.17.5 | 2.17.5 |
Published upstream
Jun 15, 2026
Evidence: source:osv:source_dates:source-dates:recordSource modified
Sep 10, 2026
Evidence: source:osv:source_dates:source-dates:recordFirst seen by HOL
Jun 19, 2026
Certain CSRF checks in React Router v7 [Framework Mode]() were insufficient and run on POST requests, but were bypassed on PUT/PATCH/DELETE requests. This is a low severity vulnerability because modern browser protections (CORS preflight, SameSite cookies) already block the cross-origin attack vectors that this missing CSRF check would otherwise gate. > [!NOTE] > This does not impact your React Router application if you are using [Declarative Mode](https://reactrouter.com/start/modes#framework) (`<BrowserRouter>`) or [Data Mode](https://reactrouter.com/start/modes#data) (`createBrowserRouter`/`<RouterProvider>`).
Quoted source text, attributed separately from HOL analysis.