CVE-2025-29927

CRITICAL

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.

CVSS v3.1 Score

9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Published: 3/21/2025Modified: 9/10/2025

Related Intelligence (1)

MEDIUMVulnerability

Started my first writeup - Sherlock NeuroSync-D (CVE-2025-29927)

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CVE-2025-29927
r/cybersecurity

References (8)

https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2Patchhttps://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48Patchhttps://github.com/vercel/next.js/releases/tag/v12.3.5Release Noteshttps://github.com/vercel/next.js/releases/tag/v13.5.9Release Noteshttps://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffwVendor Advisoryhttp://www.openwall.com/lists/oss-security/2025/03/23/3Mailing ListThird Party Advisoryhttp://www.openwall.com/lists/oss-security/2025/03/23/4Mailing Listhttps://security.netapp.com/advisory/ntap-20250328-0002/Third Party Advisory