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CVE-2026-40181

26
FAUCET Score

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.

First published: Jun 2, 2026Last modified: Jun 2, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 6.7.0, < 6.30.4CPE matchmatch criteria
cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*
>= 7.0.0, < 7.14.1CPE matchmatch criteria
cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 4.0

6.6MEDIUM

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
HIGH
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
UNREPORTED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.16%
Probability of exploitation in next 30 days
EPSS Percentile
5.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0016 is in the 5th percentile among its peer group of 26,221 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

npmpatch availablevia ghsa
Product: react-routerFixed in: 7.14.1
npmpatch availablevia ghsa
Product: react-routerFixed in: 6.30.4
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

npmGHSA-2j2x-hqr9-3h42medium

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

Jun 3, 2026

References

github.com / remix-run/react-router/security/advisories/GHSA-2j2x-hqr9-3h42
Vendor Advisory