Is CVE-2026-34077 actively exploited?

No active exploitation of CVE-2026-34077 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34077 be exploited remotely?

Yes. CVE-2026-34077 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34077?

CVE-2026-34077 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2026-34077

HIGH

CVE-2026-34077

CWE-770Published: June 2, 2026· Updated: Jun 4, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.3th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34077 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.