CVE-2026-53667CWE-79cross-site-scripting

CVE-2026-53667

Medium · published July 28, 2026

CVSS v3.1
6.9
EPSS
0%
Percentile
28.0
In the wild
Unconfirmed
What it is

React Router is a router for React. In versions 7.11.0 through 7.17.0, the RSCErrorHandler is missing protocol validation, allowing for redirects from untrusted sources. This issue is a follow up to CVE-2026-53667, and only affects consuming applications if they are using the unstable RSC APIs. This issue has been fixed in version 7.18.0.

The record
Technical detail
CVSS v3.1
6.9 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00355 · 28.0th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-07-28T02:17Z
Affected products (1)
ProductVersionsFixed in
shopify/react-router≥ 7.11.0, < 7.18.07.18.0
References (5)
https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 · [email protected]https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242 · [email protected]https://github.com/remix-run/react-router/pull/15177 · [email protected]https://github.com/remix-run/react-router/releases/tag/[email protected] · [email protected]https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh · [email protected]
EPSS history
Timeline
  • 27 JUL 21:21Z
    React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)
    cvelistv5