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React CVE-2026-21884

HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-01-10 security-advisories@github.com GHSA-8v8x-cx79-35w7
XSS React Red Hat React Router Suse
8.2
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
None

Lifecycle Timeline

3
Patch released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
CVE Published
Jan 10, 2026 - 03:15 nvd
HIGH 8.2

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 1 npm packages depend on @remix-run/react (1 direct, 0 indirect)
  • 6 npm packages depend on react-router (3 direct, 3 indirect)

Ecosystem-wide dependent count for version 2.17.3 and other introduced versions.

DescriptionNVD

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.

AnalysisAI

React Router is a router for React. In @remix-run/react version prior to 2.17.3. …

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RemediationAI

Within 7 days: Identify all affected systems and apply vendor patches promptly. Verify anti-CSRF tokens and content security policies are enforced.

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CVE-2026-21884 vulnerability details – vuln.today
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