CVE-2026-21884

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Source

https://cve.org/CVERecord?id=CVE-2026-21884

Import Source

https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21884.json

JSON Data

https://api.test.osv.dev/v1/vulns/CVE-2026-21884

Aliases

GHSA-8v8x-cx79-35w7

Downstream

RHSA-2026:3958

Published

2026-01-10T02:41:44.944Z

Modified

2026-04-29T04:15:03.732603Z

Severity

8.2 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N CVSS Calculator

Summary

React Router SSR XSS in ScrollRestoration

Details

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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21884.json",
    "cwe_ids": [
        "CWE-79"
    ],
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "last_affected": "@remix-run/react < 2.17.3"
                },
                {
                    "last_affected": "react-router  >= 7.0.0, < 7.12.0"
                }
            ]
        },
        {
            "source": "DESCRIPTION",
            "extracted_events": [
                {
                    "introduced": "7.0.0"
                },
                {
                    "fixed": "7.11.0"
                }
            ]
        }
    ],
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/remix-run/react-router

Affected ranges

Type

GIT

Repo

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

Events

Introduced

e8e3b004d94a949372e77ce97a543bff5bc6fb89

Last affected

b34a9cd1f74231ded97c1e6ca9dff8f09a1b87ca

Database specific

{
    "versions": [
        {
            "introduced": "7.0.0"
        },
        {
            "last_affected": "7.11.0"
        }
    ]
}

Database specific

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-21884.json"

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "fixed": "2.17.3"
            }
        ]
    }
]