CVE-2025-29927: exploitation status and patch state

CVE-2025-29927 · CVSS 9.1 CRITICAL · EPSS 99%

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.

Is CVE-2025-29927 exploited?

• Not in the CISA KEV catalog.
• EPSS puts exploitation in the next 30 days at 99%.
• Public exploit code: proof of concept.
• Public detection rules exist.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2025-29927

• Next.js Adds a Monthly Security Release Cadence (2026-07-16)

Primary sources

• NVD record
• Metasploit: auxiliary/scanner/http/nextjs_middleware_auth_bypass
• Exploit-DB 52124
• Nuclei template

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-11.