CVE-2026-53667

React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)

Published: Jul 27, 2026Updated: Aug 3, 2026 Sources: CVE List NVDCWE-79

6.9MEDIUM

Description

React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:RUser Interaction

Required

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:LIntegrity

Low

A:NAvailability

None

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Weaknesses

CWE-79

Affected Products

remix-run

oss-project

react-routerLibrary

OSS Libraries / web-framework

shopify

commercial·US

react-routerSaaS

Web & CMS Plugins / ecommerce-platform

Exploitability

Official Patch Available

Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Execution

Initial Access

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References

https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh

github.com

https://github.com/remix-run/react-router/pull/15177

github.com

https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242

github.com

and 2 more references View all →

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