CVE-2026-53669: Remix React Router open redirect in Link and useNavigate

CVE-2026-53669 · Severity: medium · CVSS 4 · Published 2026-07-27

React Router, a popular library for managing navigation in React web applications, is vulnerable to an open redirect flaw. An attacker can craft a malicious link using backslashes that, when clicked by a user, redirects them to an external, potentially harmful website instead of the intended page within the application. This can be used in phishing campaigns to trick users into providing credentials or downloading malware on a site that appears legitimate.

Technologies: React-Router.

Quick answers

Is CVE-2026-53669 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-53669 being exploited in the wild.
How severe is CVE-2026-53669?
Medium severity, with a CVSS score of 4, published 27 July 2026.
Which products and versions are affected?
React-Router SEMVER:introduced=6.0.0,fixed=7.18.0.
Is there a fix for CVE-2026-53669?
Yes. React-Router: upgrade to 7.18.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-53669 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-53669?
Check whether you run React-Router at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • React-Router: upgrade to 7.18.0 or later

Technical details

React Router versions 6.0.0 through 7.17.0 are vulnerable to an open redirect (CWE-601). This issue is a bypass of the fix for CVE-2025-68470. The vulnerability exists because the URL normalization logic in the <Link> component and useNavigate hook fails to properly sanitize backslashes in attacker-supplied paths. An unauthenticated remote attacker can exploit this by inducing a user to click a specially crafted link, leading to an unexpected external navigation. The issue has been addressed in version 7.18.0 by consolidating and improving the URL normalization logic.

Affected products

  • remix-run react-router >= 6.0.0, < 7.18.0

Identifiers

  • CVE-2026-53669
  • GHSA-wrjc-x8rr-h8h6

Timeline

  • 2026-06-11: patched: Fix merged into main branch via PR 15176
  • 2026-07-22: advisory: GitHub Security Advisory GHSA-wrjc-x8rr-h8h6 published
  • 2026-07-27: disclosed: CVE-2026-53669 published to NVD

References

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