CVE-2026-53666

CVE-2026-53666 affects React Router versions 6.4.0 through 7.17.0 where attacker-supplied input could overwrite parts of errors captured during SSR, enabling arbitrary constructor execution on the client and triggering outbound network requests. This requires specific, unlikely application-layer ...

CVE-2026-53666 React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

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...

CVE-2026-53666 React Router: Arbitrary Constructor Injection via deserializeErrors() in React Router SSR Hydration

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...

CVE-2026-53666

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...

Open Redirect

React Router is vulnerable to Open Redirect. The vulnerability is due to improper handling of backslashes in and useNavigate, allowing attackers to bypass redirect validation and redirect users to attacker-controlled websites...

Denial Of Service

React Router is vulnerable to Denial Of Service. The vulnerability is due to insufficient protection of the manifest endpoint, where unauthenticated targeted requests can generate excessive server load, allowing attackers to degrade application performance and slow response times...

Cross-site Request Forgery (CSRF)

Overview Affected versions of this package are vulnerable to Cross-site Request Forgery CSRF via the unstable RSC APIs. An attacker can execute unauthorized actions by tricking a user into submitting crafted requests. Note: This is only exploitable if the unstable RSC APIs are enabled in the...

NPM: React Router: RSC Mode CSRF Bypass Allows Action Execution Before 400 Response

NPM: React Router: RSC Mode CSRF Bypass Allows Action Execution Before 400 Response vulnerability discovered by ? in WordPress Npm react-router versions = 7.12.0, 8.3.0...

GHSA-QWWW-VCR4-C8H2 React Router: RSC Mode CSRF Bypass Allows Action Execution Before 400 Response

This is a follow up to CVE-2026-22030 to address related CSRF flows in unstable RSC code paths. !NOTE This only affects your application if you are using the unstable RSC APIs...

React Router: Unauthenticated Denial of Service via Inefficient Route Matching

This is a follow up to https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 that covers additional reported scenarios in which the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response...

Inefficient Algorithmic Complexity

Overview Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity through inefficient route matching in the manifest endpoint. An attacker can cause excessive server load and degrade response times by sending unauthenticated targeted requests. Note: This is only...

GHSA-CHX6-HX7R-MCP5 React Router: Unauthenticated Denial of Service via Inefficient Route Matching

This is a follow up to https://github.com/remix-run/react-router/security/advisories/GHSA-8x6r-g9mw-2r78 that covers additional reported scenarios in which the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response...

Inefficient Algorithmic Complexity

Overview Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity through inefficient route matching in the manifest endpoint. An attacker can cause excessive server load and degrade response times by sending unauthenticated targeted requests. Note: This is only...

NPM: React Router: Unauthenticated Denial of Service via Inefficient Route Matching

NPM: React Router: Unauthenticated Denial of Service via Inefficient Route Matching vulnerability discovered by ? in WordPress Npm react-router versions = 7.0.0, 7.18.0...

GHSA-WRJC-X8RR-H8H6 React Router: Open redirect via backslash in <Link> and useNavigate (CVE-2025-68470 bypass)

This is a follow up to CVE-2025-68470. React Router was alerted to certain scenarios in which the fix there was incomplete so there still existed some scenarios where attacker supplied paths passed to navigation mechanisms could result in unexpected external navigations...

React Router: Open redirect via backslash in <Link> and useNavigate (CVE-2025-68470 bypass)

This is a follow up to CVE-2025-68470. React Router was alerted to certain scenarios in which the fix there was incomplete so there still existed some scenarios where attacker supplied paths passed to navigation mechanisms could result in unexpected external navigations...

Open Redirect

Overview Affected versions of this package are vulnerable to Open Redirect via the navigation mechanisms when attacker-supplied paths containing a backslash are processed. An attacker can redirect users to unintended external sites by crafting malicious links or inputs. Remediation Upgrade...

NPM: React Router: Open redirect via backslash in <Link> and useNavigate (CVE-2025-68470 bypass)

NPM: React Router: Open redirect via backslash in and useNavigate CVE-2025-68470 bypass vulnerability discovered by ? in WordPress Npm react-router versions = 6.0.0, 7.18.0...

Open Redirect

Overview Affected versions of this package are vulnerable to Open Redirect via the navigation mechanisms when attacker-supplied paths containing a backslash are processed. An attacker can redirect users to unintended external sites by crafting malicious links or inputs. Remediation Upgrade...

NPM: React Router: Open redirect leading to XSS

NPM: React Router: Open redirect leading to XSS vulnerability discovered by ? in WordPress Npm react-router-dom versions = 6.30.2, = 6.30.4...