CVE-2026-33245: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in remix-run react-router
React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
AI Analysis
Technical Summary
CVE-2026-33245 is a client-side Cross-Site Scripting (CWE-79) vulnerability in remix-run react-router versions 7.7.0 through 7.13.1. It affects applications using the unstable React Server Components (RSC) APIs, where improper input neutralization in redirect handling can allow injection of malicious scripts if redirects come from untrusted sources. This vulnerability does not impact applications that do not use the unstable RSC APIs. The issue is fixed in version 7.13.2 of react-router.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to theft of sensitive information, session hijacking, or other client-side impacts. The CVSS score of 8.0 reflects high severity with network attack vector, high impact on confidentiality and integrity, and requiring user interaction with high attack complexity.
Mitigation Recommendations
Upgrade react-router to version 7.13.2 or later, where this vulnerability is patched. Applications not using the unstable React Server Components APIs are not affected and do not require action. Patch status is confirmed by the vendor advisory indicating the fix in version 7.13.2.
CVE-2026-33245: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in remix-run react-router
Description
React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.
CVSS v3.1
Score 8.0high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-33245 is a client-side Cross-Site Scripting (CWE-79) vulnerability in remix-run react-router versions 7.7.0 through 7.13.1. It affects applications using the unstable React Server Components (RSC) APIs, where improper input neutralization in redirect handling can allow injection of malicious scripts if redirects come from untrusted sources. This vulnerability does not impact applications that do not use the unstable RSC APIs. The issue is fixed in version 7.13.2 of react-router.
Potential Impact
Successful exploitation of this vulnerability could allow an attacker to execute arbitrary scripts in the context of the affected web application, potentially leading to theft of sensitive information, session hijacking, or other client-side impacts. The CVSS score of 8.0 reflects high severity with network attack vector, high impact on confidentiality and integrity, and requiring user interaction with high attack complexity.
Mitigation Recommendations
Upgrade react-router to version 7.13.2 or later, where this vulnerability is patched. Applications not using the unstable React Server Components APIs are not affected and do not require action. Patch status is confirmed by the vendor advisory indicating the fix in version 7.13.2.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-03-18T02:42:27.509Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1f348ce29bf47b50fa1fe1
Added to database: 6/2/2026, 7:52:44 PM
Last enriched: 6/2/2026, 8:04:03 PM
Last updated: 6/3/2026, 5:07:38 AM
Views: 4
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