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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
NVD MITRE
EPSS Score
0.4%
Top 72.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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

AV:NAC:HPR:NUI:RS:CC:HI:LA:N
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
View detailed technique mapping

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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