XSS Vulnerability in React Router meta()/Meta APIs During SSR

Publication date: 2026-01-10

Last updated on: 2026-06-30

Assigner: GitHub, Inc.

Description

React Router is a router for React. In @remix-run/react versions 1.15.0 through 2.17.0. and react-router versions 7.0.0 through 7.8.2, a XSS vulnerability exists in in React Router's meta()/<Meta> APIs in Framework Mode when generating script:ld+json tags which could allow arbitrary JavaScript execution during SSR if untrusted content is used to generate the tag. There is no impact if the application is being used in Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter/<RouterProvider>). This issue has been patched in @remix-run/react version 2.17.1 and react-router version 7.9.0.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-01-10

Last Modified

2026-06-30

Generated

2026-07-06

AI Q&A

2026-01-10

EPSS Evaluated

2026-07-05

NVD

CVE-2025-59057

Affected Vendors & Products

Vendor	Product	Version / Range
remix-run	react	From 1.15.0 (inc) to 2.17.0 (inc)
remix-run	react	From 2.17.1 (inc)
react-router	react-router	From 7.0.0 (inc) to 7.8.2 (inc)
react-router	react-router	From 7.9.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

CVE-2025-59057 is a high-severity Cross-Site Scripting (XSS) vulnerability in React Router's meta() / <Meta> APIs when used in Framework Mode. It occurs during server-side rendering (SSR) when generating script:ld+json tags if untrusted content is used. This can allow attackers to execute arbitrary JavaScript code. The vulnerability affects @remix-run/react versions 1.15.0 through 2.17.0 and react-router versions 7.0.0 through 7.8.2. Applications using Declarative Mode or Data Mode are not affected. The issue has been patched in later versions. [1]

Impact Analysis

This vulnerability can allow an attacker to execute arbitrary JavaScript code during server-side rendering if untrusted content is used to generate JSON-LD script tags. This can lead to confidentiality breaches (high impact), as sensitive data could be exposed, and integrity issues (low impact), potentially compromising the security of the application. However, availability is not impacted. Exploitation requires network access and some user interaction. [1]

Mitigation Strategies

To mitigate this vulnerability, immediately upgrade the affected packages to the patched versions: update @remix-run/react to version 2.17.1 or later, and react-router to version 7.9.0 or later. Additionally, if possible, avoid using Framework Mode with meta()/ <Meta> APIs to generate script:ld+json tags from untrusted content during server-side rendering. Consider using Declarative Mode (<BrowserRouter>) or Data Mode (createBrowserRouter / <RouterProvider>) as these modes are not affected by this vulnerability. [1]

Hi! I’m here to help you understand CVE-2025-59057. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70