How severe is CVE-2026-33245?

CVE-2026-33245 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-33245 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33245?

CVE-2026-33245 affects Shopify React-router. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33245?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-33245 have an EU (EUVD) identifier?

Yes. CVE-2026-33245 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33988.

When was CVE-2026-33245 published?

CVE-2026-33245 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-33245

CVE-2026-33245 is a high-severity vulnerability in Shopify React-router with a CVSS 3.x base score of 8.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: High (CVSS 3.x base score 8.0)
EPSS exploit prediction: 0% (9th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33988
Weakness: CWE-79
Affected product: Shopify React-router
Published: 2026-06-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-33245?: 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.
How severe is CVE-2026-33245?: CVE-2026-33245 has a CVSS 3.x base score of 8.0, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-33245 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (9th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33245?: CVE-2026-33245 affects Shopify React-router. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33245?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-33245 have an EU (EUVD) identifier?: Yes. CVE-2026-33245 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33988.
When was CVE-2026-33245 published?: CVE-2026-33245 was published on 2026-06-02 and last updated on 2026-06-17.

References

https://github.com/remix-run/react-router/security/advisories/GHSA-8646-j5j9-6r62

Affected products (1)

cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*

More vulnerabilities in Shopify React-router

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