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Atomicorp WAF Rule 345230

Rule Summary

  • Rule ID: 345230
  • Status: Active
  • Alert message: Atomicorp.com WAF Rules: CVE-2025-29927 Next.js middleware authentication bypass attempt
  • Observed CWEs: None documented
  • Revision: 2
  • Rule severity: Critical
  • Phase: 1 (request headers)
  • Rule action: deny
  • HTTP status: 403
  • Public tags: attack-authbypass
  • Logging: log, auditlog

Description

This rule detects behavior identified by its current alert as “CVE-2025-29927 Next.js middleware authentication bypass attempt”. It evaluates during the request headers phase and denies matching traffic with HTTP status 403.

CVEs Referenced by This Rule

The current ModSecurity rule metadata explicitly names the following CVEs. These references explain the rule author’s association; they do not claim that the rule is limited to these vulnerabilities or that this is an exhaustive coverage list.

CVE-2025-29927

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.

This is a selected list of documented research observations, not an exhaustive coverage matrix. Absence of a CVE does not imply absence of protection.

No selected related public CVE research notes are currently published.