CRITICAL

CVE-2025-29927

CVSS v3

9.1

CRITICAL

EPSS Score

99.2 %

exploit probability, as of 2026-10-05

CISA KEV

known exploited

Exploitation

—

SSVC status

Description

Next.js is a React framework for building full-stack web applications. Starting in version 1.11.4 and prior to versions 12.3.5, 13.5.9, 14.2.25, and 15.2.3, it is possible to bypass authorization checks within a Next.js application, if the authorization check occurs in middleware. If patching to a safe version is infeasible, it is recommend that you prevent external user requests which contain the x-middleware-subrequest header from reaching your Next.js application. This vulnerability is fixed in 12.3.5, 13.5.9, 14.2.25, and 15.2.3.

Technical details

Published: 2025-03-21
Exploit-DB: EDB-52124

Frequently asked questions

What is CVE-2025-29927?

Is CVE-2025-29927 actively exploited?

Active exploitation of CVE-2025-29927 has not been confirmed. Its EPSS score was 99.2% on 2026-10-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2025-29927?

CVE-2025-29927 has a CVSS v3 base score of 9.1 (CRITICAL severity).

Is CVE-2025-29927 affecting your environment?

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