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: CWE-285 (1), CWE-863 (1)
• 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.

• Association: The rule references CVE-2025-29927 in its alert message.
• CVE Record (opens in a new tab)
• NVD (opens in a new tab)

Selected Related CVEs

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

Observed CWEs

These CWEs are recorded on published CVEs in the selected observations associated with this rule. They are observational relationships, not a claim that the rule universally blocks every vulnerability assigned to a CWE.