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Not in CISA KEV
HIGH severity

CVE-2026-33245 — react-router

HIGH

CVE-2026-33245 is a high-severity (CVSS 8) Cross-site Scripting (XSS) vulnerability in react-router. A fix is available for react-router — see the affected versions and patch details below.

React Router vulnerable to XSS in unstable RSC redirect handling via javascript: redirect targets

Also known asGHSA-8646-j5j9-6r62
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-33245.

EPSS Exploitation Probability

via FIRST.org ↗
0.2%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs9th percentile — riskier than 9% of all scored CVEsHighest risk
0.00%0.24%0.49%0.73%0.2%0.2%Jul 26Oct 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

9Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
react-routernpm
75.0Mdownloads / week

Description

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmreact-router≥ 7.7.0&&< 7.13.27.13.2npm install react-router@7.13.2

Affected Products

1 product · 1 configurations
Application
react-routershopify
≥ 7.7.0 && < 7.13.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for react-router, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update react-router to 7.13.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-33245 is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

This vulnerability is rated as Moderate impact for Red Hat products because successful exploitation requires an application to implement experimental React Server Components features alongside unvalidated external navigation targets. Red Hat web applications and management consoles typically utilize standard routing…

Workaround published by Red Hat
To mitigate this Cross-Site Scripting (XSS) vulnerability, ensure that applications utilizing React Router's unstable React Server Components (RSC) APIs only process redirects from trusted sources. Avoiding the use of these unstable APIs in production environments where untrusted redirect sources cannot be guaranteed is also recommended.
Source: Red Hat security advisory for CVE-2026-33245 (CC BY 4.0)
ProductFixed inAdvisory
Red Hat Data Grid 8.6.2react-routerRHSA-2026:41951
Red Hat Discovery 2discovery/discovery-ui-rhel9:1792603924RHSA-2026:91967
Red Hat Discovery 2discovery/discovery-ui-rhel9:1793218530RHSA-2026:92136
Red Hat OpenShift AI 3.3rhoai/odh-dashboard-rhel9:1783082634RHSA-2026:37275
Red Hat OpenShift AI 3.3rhoai/odh-dashboard-rhel9:1790128681RHSA-2026:73987
Red Hat OpenShift AI 3.4rhoai/odh-mod-arch-automl-rhel9:1782722421RHSA-2026:34456
Red Hat OpenShift AI 3.4rhoai/odh-dashboard-rhel9:1787347991RHSA-2026:60520
Red Hat OpenShift Dev Spaces 3.29devspaces/dashboard-rhel9:1784737150RHSA-2026:48124

Frequently Asked Questions

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
O3 Security · Impact-Aware SCA

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CVE-2026-33245: react-router XSS — Fixed in 7.13.2