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 through 7.14.0 and 6.7.0 through 6.30.3 contain an open redirect vulnerability (CWE-601) where certain URLs starting with // passed to the redirect function are treated as protocol-relative URLs, enabling redirection to external domains. This behavior depends on the application's validation of redirect URLs. Applications using Declarative Mode (<BrowserRouter>) are not impacted. The vulnerability is addressed in versions 7.14.1 and 6.30.4.
Potential Impact
This vulnerability allows an attacker to craft URLs that cause the application to redirect users to untrusted external sites, potentially facilitating phishing or other malicious activities. The actual impact depends on how the application validates redirect URLs before invoking the redirect function. There is no indication of active exploitation in the wild.
Mitigation Recommendations
A fix is available in react-router versions 7.14.1 and 6.30.4. Users should upgrade to these versions or later to remediate the vulnerability. Applications using Declarative Mode (<BrowserRouter>) are not affected by this issue.
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
Affected software
remix-run
react-router
remix-run
@remix-run/router
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
React Router versions 7.0.0 through 7.14.0 and 6.7.0 through 6.30.3 contain an open redirect vulnerability (CWE-601) where certain URLs starting with // passed to the redirect function are treated as protocol-relative URLs, enabling redirection to external domains. This behavior depends on the application's validation of redirect URLs. Applications using Declarative Mode (<BrowserRouter>) are not impacted. The vulnerability is addressed in versions 7.14.1 and 6.30.4.
Potential Impact
This vulnerability allows an attacker to craft URLs that cause the application to redirect users to untrusted external sites, potentially facilitating phishing or other malicious activities. The actual impact depends on how the application validates redirect URLs before invoking the redirect function. There is no indication of active exploitation in the wild.
Mitigation Recommendations
A fix is available in react-router versions 7.14.1 and 6.30.4. Users should upgrade to these versions or later to remediate the vulnerability. Applications using Declarative Mode (<BrowserRouter>) are not affected by this issue.
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
Threat ID: 6a1f348ce29bf47b50fa1ff9
Added to database: 06/02/2026, 19:52:44 UTC
Last enriched: 08/05/2026, 13:30:58 UTC
Last updated: 09/11/2026, 07:31:53 UTC
Views: 155
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