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Vulnerability record · CVE-2026-53666 · published 27 July 2026

CVE-2026-53666: Shopify react-router vulnerability

Shopify · React Router

React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.

6.1 CVSS 3.1 Medium EPSS 0.42% · top 66.1% CWE-470 · CWE-470
6.1CVSS 3.1 base score
0.42%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
3 Aug 2026Last modified by NVD

Description

React Router is a router for React. In versions 6.4.0 through 7.17.0, if application code was written in a way that allows attacker-supplied input to overwrite certain aspects of errors caught by the SSR process, then it was possible for an attacker to trigger unexpected constructor execution on the client, which would in turn trigger an outbound network request. This is only possible with very specific (and unlikely) application-layer code. Note that this does not impact an application if it is using Declarative Mode. It only impacts Framework Mode and Data Mode applications that perform manual SSR/hydration. This issue has been fixed in version 7.18.0.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 Release Notes
https://github.com/remix-run/react-router/commit/9d22943fd46c8ae4b08236425fa3549e10e9ad1a Patch
https://github.com/remix-run/react-router/pull/15175 Issue TrackingPatch
https://github.com/remix-run/react-router/releases/tag/[email protected] Release Notes
https://github.com/remix-run/react-router/security/advisories/GHSA-337j-9hxr-rhxg Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-53666), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.