CVE-2026-53667
React Router: Cross-site Scripting is Possible due to Missing RSCErrorHandler Protocol Validation (Incomplete fix for CVE-2026-53667)
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.
INFO
Published Date :
July 27, 2026, 10:17 p.m.
Last Modified :
Aug. 3, 2026, 1:58 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | MEDIUM | MITRE-CVE | ||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update React Router to version 7.18.0.
- Ensure unstable RSC APIs are not used if updating is not possible.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-53667.
| URL | Resource |
|---|---|
| https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 | Release Notes |
| https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242 | Patch |
| https://github.com/remix-run/react-router/pull/15177 | Issue Tracking Patch |
| https://github.com/remix-run/react-router/releases/tag/[email protected] | Release Notes |
| https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh | Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-53667 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-53667
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-53667 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-53667 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 03, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Added CPE Configuration OR *cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:* versions from (including) 7.11.0 up to (excluding) 7.18.0 Added Reference Type GitHub, Inc.: https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/remix-run/react-router/pull/15177 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/remix-run/react-router/releases/tag/[email protected] Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh Types: Third Party Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 28, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-53667', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-28T13:51:03.703369Z'} -
New CVE Received by [email protected]
Jul. 27, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'remix-run', 'product': 'react-router', 'versions': [{'status': 'affected', 'version': '>= 7.11.0, < 7.18.0'}]}] Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N Added CWE CWE-79 Added Reference https://github.com/remix-run/react-router/blob/main/CHANGELOG.md#v7180 Added Reference https://github.com/remix-run/react-router/commit/ce596e823f0d7b883a433af1d5a839a8b9fe0242 Added Reference https://github.com/remix-run/react-router/pull/15177 Added Reference https://github.com/remix-run/react-router/releases/tag/[email protected] Added Reference https://github.com/remix-run/react-router/security/advisories/GHSA-h8fp-f39c-q6mh