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CVE-2025-29927

Authorization Bypass in Next.js Middleware

Published: Mar 21, 2025Updated: Sep 10, 2025 Sources: CVE List NVD GHSA BDUCWE-285
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
98.4%
Top 0.1%
CISA KEV
Not in KEV
Exploits
6 Known
Remediation
Patch Available
Am I actually vulnerable?2 Nuclei templates available — see how to check your systems. How to verify

Description

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-285CWE-863

Affected Products

next.jsvercel
LibraryLibrary
OSS Libraries / web-framework
nextnpmOSS Libraries
Next.jsVercel
LibraryLibrary
OSS Libraries / web-framework
vercelcommercialUSOSS Librariesaka vercel
npmpackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

6 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2
github.com
https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48
github.com
https://github.com/vercel/next.js/releases/tag/v12.3.5
github.com
and 11 more references View all →

Timeline

Published
Mar 21, 2025
Last Updated
Sep 10, 2025

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