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Vulnerabilities CVE-2026-40181

CVE-2026-40181

Medium
Open
TLP:CLEAR

React Router's same-origin redirect with path starting // causes open redirect via protocol-relative URL reinterpretation

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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.

Details

CVSS Score
6.6
EPSS Score
0.16%

5.9th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U
Confidence
90%
Published
Jun 2, 2026
Last Modified
Aug 4, 2026
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