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Medium severity · published Jul 27, 2026
CVE-2026-53667
React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)
6.1
CVSS
0.4%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RE
react-router · remix-run
>= 7.11.0, < 7.18.0 · source: vendor, NVD
Affected product
RE
react-router
remix-run
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53667
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53667
Release Notes
https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180
Patch
https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242
Issue Tracking
https://github.com/remix-run/react-router/pull/15177
Release Notes
https://github.com/remix-run/react-router/releases/tag/react-router@7.18.0
Third Party Advisory
https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh
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