How severe is CVE-2026-40181?

CVE-2026-40181 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-40181 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-40181?

CVE-2026-40181 affects Shopify React-router. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40181?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40181 have an EU (EUVD) identifier?

Yes. CVE-2026-40181 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33996.

When was CVE-2026-40181 published?

CVE-2026-40181 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-40181

CVE-2026-40181 is a medium-severity vulnerability in Shopify React-router with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-601.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 6.6
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33996
Weakness: CWE-601
Affected product: Shopify React-router
Published: 2026-06-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-40181?: 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.
How severe is CVE-2026-40181?: CVE-2026-40181 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-40181 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-40181?: CVE-2026-40181 affects Shopify React-router. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40181?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40181 have an EU (EUVD) identifier?: Yes. CVE-2026-40181 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33996.
When was CVE-2026-40181 published?: CVE-2026-40181 was published on 2026-06-02 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:shopify:react-router:*:*:*:*:*:node.js:*:*

More vulnerabilities in Shopify React-router

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Other CWE-601 (Open Redirect) vulnerabilities

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CVE-2020-36912 — Critical (CVSS 9.8): Plexus anblick Digital Signage Management 3.1.13 contains an open redirect vulnerability in the 'PantallaLogin' script…
CVE-2025-43526 — Critical (CVSS 9.8): This issue was addressed with improved URL validation. This issue is fixed in Safari 26.2, macOS Tahoe 26.2. On a Mac…
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CVE-2024-22891 — Critical (CVSS 9.8): Nteract v.0.28.0 was discovered to contain a remote code execution (RCE) vulnerability via the Markdown link.

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