SEPTEMBER 19, 2026
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Case File

CVE-2026-53666

MEDIUM · CVSS 6.1 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-07-27 · Last synced 2026-08-26

CyberRota Analysis

AI-Generated

Versions 6.4.0 through 7.17.0 of React Router are vulnerable to a potential security flaw that allows attacker-supplied input to manipulate error handling during server-side rendering (SSR), leading to unexpected constructor execution and outbound network requests. This vulnerability primarily affects applications using Framework Mode and Data Mode with manual SSR/hydration, making it essential for developers using these configurations to prioritize upgrading to version 7.18.0 or later to mitigate the risk.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-53666
Severity
MEDIUM
CVSS
6.1
EPSS
0.30%

Original 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.

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