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 high-severity client-side Cross-Site Scripting (CWE-79) vulnerability in remix-run's react-router package. It affects versions from 7.7.0 up to but not including 7.13.2. The vulnerability occurs specifically when using the unstable React Server Components (RSC) APIs, where improper neutralization of input during web page generation in redirect handling can lead to XSS if redirects come from untrusted sources. This vulnerability does not impact applications that do not use the unstable RSC APIs. The vulnerability is patched in react-router version 7.13.2.
Potential Impact
Successful exploitation can lead to client-side code execution via XSS, potentially allowing attackers to steal sensitive information or perform actions on behalf of users. The CVSS v3.1 score is 8.0 (High), reflecting network attack vector, high impact on confidentiality and integrity, but requiring user interaction and 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. No other mitigations are specified.
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 high-severity client-side Cross-Site Scripting (CWE-79) vulnerability in remix-run's react-router package. It affects versions from 7.7.0 up to but not including 7.13.2. The vulnerability occurs specifically when using the unstable React Server Components (RSC) APIs, where improper neutralization of input during web page generation in redirect handling can lead to XSS if redirects come from untrusted sources. This vulnerability does not impact applications that do not use the unstable RSC APIs. The vulnerability is patched in react-router version 7.13.2.
Potential Impact
Successful exploitation can lead to client-side code execution via XSS, potentially allowing attackers to steal sensitive information or perform actions on behalf of users. The CVSS v3.1 score is 8.0 (High), reflecting network attack vector, high impact on confidentiality and integrity, but requiring user interaction and 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. No other mitigations are specified.
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: 06/02/2026, 19:52:44 UTC
Last enriched: 06/10/2026, 11:03:13 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 77
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