Medium 6.9Published Jul 27, 2026

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

Updated under an hour ago (Oct 28, 2026, 3:23 AM ET)

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It affects remix-run react-router and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for remix-run react-router

Exploited in the last 30 days

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.

CVSS: 6.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Jul 28, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

remix-run react-router remix_run:react_router (from the name)	from 7.11.0, < 7.18.0	CNA record
shopify react-router shopify:react-router	from 7.11.0 before 7.18.0	NVD

References

References

https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh	x-refsource-confirm, third-party-advisory
https://github.com/remix-run/react-router/pull/15177	x-refsource-misc, issue-tracking, patch
https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242	x-refsource-misc, patch
https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180	x-refsource-misc, release-notes
https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.