Vulnerability Report

CVE-2025-29927

Title: Vercel Next.Js Auth Bypass

Other

Proof Of Concept

PoC Available for CVE-2025-29927

CWE Category CWE-863
Published Date Mar 21, 2025
Modified Date Sep 10, 2025
Exploit Status Available
Score 9.1 CVSS v3.1
Exploit Probability (EPSS)
92.12%

Vulnerability Summary

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.

Impacted Vendors

V
vercel 1
K
kanopi 1
Z
zeit 1

Reference Links

https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2 https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48 https://github.com/vercel/next.js/releases/tag/v12.3.5 https://github.com/vercel/next.js/releases/tag/v13.5.9 https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw http://www.openwall.com/lists/oss-security/2025/03/23/3 http://www.openwall.com/lists/oss-security/2025/03/23/4 https://security.netapp.com/advisory/ntap-20250328-0002/
CVSS v3.1
Source Entity [email protected]
Severity CRITICAL
9.1
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-29927 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/6mile/nextjs-CVE-2025-29927
View Code
GitHub https://github.com/emadshanab/CVE-2025-29927
View Code
GitHub https://github.com/aydinnyunus/CVE-2025-29927
View Code
Exploit-DB https://www.exploit-db.com/exploits/52124
View Code
MODIFIED

Vulnerability data or affected products updated.

MODIFIED

Vulnerability data updated via NVD.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Stack

No specific products linked.