CVE-2026-40181: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in remix-run react-router
React Router is a router for React. In versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3, certain URLs passed to the redirect function can trigger an open redirect to an external domain due to path values starting with // being reinterpreted as protocol-relative URLs. The level of impact depends on the validation done by the application prior to returning the redirect. This does not impact applications using Declarative Mode (<BrowserRouter>). This is patched in versions 7.14.1 and 6.30.4.
AI Analysis
Technical Summary
React Router versions 7.0.0 to 7.14.0 and 6.7.0 to 6.30.3 contain an open redirect vulnerability (CWE-601) where the redirect function mishandles URLs starting with //, treating them as protocol-relative URLs and enabling redirection to external domains. The impact depends on the application's validation of redirect URLs. Applications using Declarative Mode (<BrowserRouter>) are not vulnerable. The issue is fixed in versions 7.14.1 and 6.30.4.
Potential Impact
The vulnerability allows attackers to craft URLs that cause the application to redirect users to untrusted external sites, potentially facilitating phishing or other social engineering attacks. The actual impact depends on how the application validates redirect URLs before invoking the redirect function. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
This vulnerability is patched in react-router versions 7.14.1 and 6.30.4. Users should upgrade to these or later versions to remediate the issue. Applications using Declarative Mode (<BrowserRouter>) are not affected. Patch status is confirmed by the vendor advisory indicating fixed versions. No additional mitigation is required beyond upgrading.
CVE-2026-40181: CWE-601: URL Redirection to Untrusted Site ('Open Redirect') in remix-run react-router
Description
React Router is a router for React. In versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3, certain URLs passed to the redirect function can trigger an open redirect to an external domain due to path values starting with // being reinterpreted as protocol-relative URLs. The level of impact depends on the validation done by the application prior to returning the redirect. This does not impact applications using Declarative Mode (<BrowserRouter>). This is patched in versions 7.14.1 and 6.30.4.
CVSS v4.0
Score 6.6medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
React Router versions 7.0.0 to 7.14.0 and 6.7.0 to 6.30.3 contain an open redirect vulnerability (CWE-601) where the redirect function mishandles URLs starting with //, treating them as protocol-relative URLs and enabling redirection to external domains. The impact depends on the application's validation of redirect URLs. Applications using Declarative Mode (<BrowserRouter>) are not vulnerable. The issue is fixed in versions 7.14.1 and 6.30.4.
Potential Impact
The vulnerability allows attackers to craft URLs that cause the application to redirect users to untrusted external sites, potentially facilitating phishing or other social engineering attacks. The actual impact depends on how the application validates redirect URLs before invoking the redirect function. There are no known exploits in the wild as of the published date.
Mitigation Recommendations
This vulnerability is patched in react-router versions 7.14.1 and 6.30.4. Users should upgrade to these or later versions to remediate the issue. Applications using Declarative Mode (<BrowserRouter>) are not affected. Patch status is confirmed by the vendor advisory indicating fixed versions. No additional mitigation is required beyond upgrading.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-09T20:59:17.619Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1f348ce29bf47b50fa1ff9
Added to database: 6/2/2026, 7:52:44 PM
Last enriched: 6/2/2026, 8:04:34 PM
Last updated: 6/3/2026, 5:01:08 AM
Views: 3
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