High 8.2Published Jan 9, 2026

CVE-2026-21884React Router SSR XSS in ScrollRestoration

Updated under an hour ago (Oct 27, 2026, 6:10 AM ET)

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It affects remix-run react-router and 6 other products. Add what you run to find out whether that includes you.

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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 @remix-run/react version prior to 2.17.3. and react-router 7.0.0 through 7.11.0, a XSS vulnerability exists in in React Router's <ScrollRestoration> API in Framework Mode when using the getKey/storageKey props during Server-Side Rendering which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the keys. There is no impact if server-side rendering in Framework Mode is disabled, or if Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>) is being used. This issue has been patched in @remix-run/react version 2.17.3 and react-router version 7.12.0.

CVSS: 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/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: Modified
Record last updated: Jul 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

remix-run react-router remix_run:react_router (from the name)	@remix-run/react < 2.17.3; react-router >= 7.0.0, < 7.12.0	CNA record
Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9 redhat:ansible_automation_platform	from 0:2.6.6-1.el9ap not affected	CISA ADP
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai	from 1772093424 not affected	CISA ADP
Red Hat Red Hat Build of Kueue redhat:kueue_operator	1	CISA ADP
Red Hat Red Hat Enterprise Linux 10 redhat:enterprise_linux	10	CISA ADP
shopify react-router shopify:react-router	from 7.0.0 through 7.11.0	NVD
shopify remix-run/react shopify:remix-run/react	before 2.17.3	NVD

References

References

https://github.com/remix-run/react-router/security/advisories/GHSA-8v8x-cx79-35w7	x-refsource-confirm, third-party-advisory
https://access.redhat.com/errata/RHSA-2026:19712
https://access.redhat.com/errata/RHSA-2026:3782
https://access.redhat.com/errata/RHSA-2026:3958
https://access.redhat.com/errata/RHSA-2026:3960
https://access.redhat.com/security/cve/CVE-2026-21884
https://bugzilla.redhat.com/show_bug.cgi?id=2428421
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21884.json

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.