CVE-2026-40181Network attack vector

Open redirect via unnormalized double-slash path

Published Jun 2, 2026 · Updated Jun 2, 2026

Open redirect in React Router 6.7.0 through 6.30.3 and 7.0.0 through 7.14.0 allows remote attackers to send users to external domains. normalizeRedirectLocation returns a same-origin URL pathname unchanged, so a leading // in the Location value is reinterpreted as a protocol-relative external URL. Reachability requires Data or Framework Mode and an application that passes an attacker-influenced URL to redirect without rejecting it; Declarative Mode is unaffected.

CVSS severity6.1
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in React Router 6.7.0 through 6.30.3 and 7.0.0 through 7.14.0 allows remote attackers to send users to external domains. normalizeRedirectLocation returns a same-origin URL pathname unchanged, so a leading // in the Location value is reinterpreted as a protocol-relative external URL. Reachability requires Data or Framework Mode and an application that passes an attacker-influenced URL to redirect without rejecting it; Declarative Mode is unaffected.

The record

CVE
CVE-2026-40181
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Shopify
Product
React Router
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 6.7.0, < 6.30.4
  2. Affected versionversion=>= 7.0.0, < 7.14.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shopify · React Routerversion=>= 6.7.0, < 6.30.4; version=>= 7.0.0, < 7.14.1

Published CVSS scores

6.6GitHub, Inc.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
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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