CVE-2026-33245Network attack vector

Client-side script execution via unvalidated RSC redirects

Published Jun 2, 2026 · Updated Jun 2, 2026

Client-side XSS in Shopify React Router 7.7.0 through 7.13.1 allows remote attackers to execute JavaScript via RSC redirects. The createCallServer RSC response path assigns a server-supplied redirect location to window.location.href without rejecting javascript: protocols. Exploitation requires an application to use the unstable RSC APIs, accept an untrusted redirect source, and induce a user to follow the resulting flow; successful script execution occurs in that application's browser origin.

CVSS severity8.0
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Client-side XSS in Shopify React Router 7.7.0 through 7.13.1 allows remote attackers to execute JavaScript via RSC redirects. The createCallServer RSC response path assigns a server-supplied redirect location to window.location.href without rejecting javascript: protocols. Exploitation requires an application to use the unstable RSC APIs, accept an untrusted redirect source, and induce a user to follow the resulting flow; successful script execution occurs in that application's browser origin.

The record

CVE
CVE-2026-33245
Published
Jun 2, 2026
Updated
Jun 2, 2026
Vendor
Shopify
Product
React Router
Classifications
CWE-79, T1059.007
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=>= 7.7.0, < 7.13.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Shopify · React Routerversion=>= 7.7.0, < 7.13.2

Published CVSS scores

8.0GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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