CVE-2026-34077 — HIGH (7.5)

Q: How severe is CVE-2026-34077?

CVE-2026-34077 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-34077?

Check the references section above for vendor advisories and patch information. Affected products include: Shopify React-Router, Turbo-Stream Turbo Stream.

Vulnerability Description

React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS) vulnerability in the RSC redirect handling if redirects come from untrusted sources. This does not impact applications that are not using the unstable RSC APIs in React Router. This is patched in version 7.13.2.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Shopify	React-Router	>= 7.0.0, < 7.14.0
Turbo-Stream	Turbo Stream	< 3.0.0

Related Weaknesses (CWE)

CWE-770

References

https://github.com/remix-run/react-router/security/advisories/GHSA-rxv8-25v2-qmqVendor Advisory

FAQ

What is CVE-2026-34077?

CVE-2026-34077 is a vulnerability with a CVSS score of 7.5 (HIGH). React Router is a router for React. In versions 7.7.0 through 7.13.1, when using React Router's unstable React Server Components (RSC) APIs, there is a potential client-side Cross-Site Scripting (XSS)...

How severe is CVE-2026-34077?

CVE-2026-34077 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-34077?

Check the references section above for vendor advisories and patch information. Affected products include: Shopify React-Router, Turbo-Stream Turbo Stream.