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 ...

EUVD-2026-49628

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...

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: Use of Externally-Controlled Input to Select Classes or Code

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-2026-53667: Improper Neutralization of Input During Web Page Generation

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...

CVE-2026-53669: URL Redirection to Untrusted Site

React Router is a router for React. Versions 6.0.0 through 7.17.0 are vulnerable to Open Redirtect through use of backslashes in and useNavigate. This issue is a follow up to CVE-2025-68470 and has been fixed in version 7.18.0...

CVE-2026-55685: Uncontrolled Resource Consumption

React Router is a router for React. In versions 7.0.0 through 7.17.0, the manifest endpoint could be accessed via unauthenticated targeted requests that would put heavy load on the server and slow down response times. This issue is a follow up to CVE-2026-42342, and does not does not impact React...

CVE-2026-53668: URL Redirection to Untrusted Site

React Router is a router for React. In versions 6.30.2 through 6.30.4 and 7.9.6 through 7.12.0, applications that allow open redirects are vulnerable to XSS. An attacker could craft a malicious link that redirects users to an unexpected external site or that exploits an XSS vector.This issue has...

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...

@aaravpos/appointment-barber-booking (>=1.0.0, <=4.0.6), @aaravpos/appointment-booking-plugin (>=1.0.1, <=8.0.2) +274 more potentially affected by unknown CVE via react-router (>=7.12.0, <=7.18.1)

react-router NPM version =7.12.0, =1.0.0, =1.0.1, =0.0.9-alpha-20260107202750-16b04dcbaa92c7fc2bbb580dbc1da723c76a5225, =1.3.7, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.127 and more Source...

@aaravpos/appointment-barber-booking (>=1.0.0, <=4.0.6), @aaravpos/appointment-booking-plugin (>=1.0.1, <=8.0.2) +274 more potentially affected by unknown CVE via react-router (>=7.12.0, <=7.18.1)

react-router NPM version =7.12.0, =1.0.0, =1.0.1, =0.0.9-alpha-20260107202750-16b04dcbaa92c7fc2bbb580dbc1da723c76a5225, =1.3.7, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.0, =3.2.0-ultramodern.127 and more Source...

@appigram/react-code-split-ssr (>=2.1.0, <=2.1.2), @ariestools/sdk-react-crypto (>=11.1.1, <=11.1.5) +35 more potentially affected by unknown CVE via react-router (>=8.0.0-pre.1, <=8.2.0)

react-router NPM version =8.0.0-pre.1, =2.1.0, =11.1.1, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0,...

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...

@appigram/react-code-split-ssr (>=2.1.0, <=2.1.2), @ariestools/sdk-react-crypto (>=11.1.1, <=11.1.5) +35 more potentially affected by unknown CVE via react-router (>=8.0.0-pre.1, <=8.2.0)

react-router NPM version =8.0.0-pre.1, =2.1.0, =11.1.1, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.0, =3.4.0-ultramodern.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...

31g-form-parser (1.0.107), @aaravpos/appointment-barber-booking (>=1.0.0, <=4.0.6) +448 more potentially affected by CVE-2026-55685 via react-router (>=7.0.0, <=7.17.0)

react-router NPM version =7.0.0, =1.0.0, =1.0.1, =0.0.3-alpha-20241124130832-1498e8a00d2fa532e452b5ad126a753f4844a237, =1.3.7, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =0.1.0, =0.0.2, =3.2.0-ultramodern.0, =3.2.0-ultramodern.127 and more Source cves: CVE-2026-55685 Source advisory: OSV: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...