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CVE

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

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.

CRITICAL · CVSS 9.1 EPSS 0.92118
Act now
  • EPSS ≥ 0.50 - high probability of exploitation in the next 30 days
  • EPSS percentile: top 0% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-285Improper Authorization
CWE-863Incorrect Authorization
▤

Affected Products & Versions

4
vercel next.js>= 11.1.4 and < 12.3.5
vercel next.js>= 13.0.0 and < 13.5.9
vercel next.js>= 14.0.0 and < 14.2.25
vercel next.js>= 15.0.0 and < 15.2.3
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
npm next CRITICAL fixed in 13.5.9
⚠

Public Exploits & PoCs

4
webappsNext.js Middleware 15.2.2 - Authorization Bypass2025-04-05
nucleiNext.js Middleware Authorization Bypasscritical
nucleiCrushFTP - Authentication Bypasscritical
nucleiNext.js Middleware Bypasscritical
◈

Detection Rules (IDS/IPS)

1
et-openET WEB_SERVER Next.js Middleware Authorization Bypass (CVE-2025-29927)web-application-attack
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

9.1
CRITICAL · CVSS v3.1 · security-advisories@github.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD21 Mar 2025 · 03:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/vercel/next.js/commit/52a078da3884efe6501613c7834a3d02a91676d2Patch
https://github.com/vercel/next.js/commit/5fd3ae8f8542677c6294f32d18022731eab6fe48Patch
https://github.com/vercel/next.js/releases/tag/v12.3.5Release Notes
https://github.com/vercel/next.js/releases/tag/v13.5.9Release Notes
https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffwVendor Advisory
http://www.openwall.com/lists/oss-security/2025/03/23/3Mailing ListThird Party Advisory
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