PT-2026-49578 · Npm · @Remix-Run/Server-Runtime+1

Published 2026-06-15 · Updated 2026-06-15 · CVE-2026-53663

Positive Technologies (AI Summary)

CVSS v3.1

3.1

Low

Base vector

AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N

Name of the Vulnerable Software and Affected Versions React Router version 7

Description Insufficient Cross-Site Request Forgery (CSRF) checks in Framework Mode allow bypasses when using 'PUT', 'PATCH', or 'DELETE' requests, as the checks were primarily applied to 'POST' requests. CSRF is a type of attack where an unauthorized command is transmitted from a user that the web application trusts. This issue is mitigated by modern browser protections such as SameSite cookies and CORS preflight checks.

Recommendations Update React Router version 7 to a version containing the fix. As a temporary mitigation, avoid using Framework Mode or switch to Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>).

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-53663

GHSA-84G9-W2XQ-VCV6

Affected Products

@Remix-Run/Server-Runtime

React Router

References · 4

• https://osv.dev/vulnerability/GHSA-84g9-w2xq-vcv6 · Vendor Advisory
• https://github.com/remix-run/react-router · Note
• https://github.com/remix-run/react-router/security/advisories/GHSA-84g9-w2xq-vcv6 · Note
• https://twitter.com/dailycve/status/2066631994612527599 · Twitter Post