CVE-2025-29927 (GCVE-0-2025-29927)

Vulnerability from cvelistv5 – Published: 2025-03-21 14:34 – Updated: 2025-04-08 15:17
VLAI Previdian
Title
Authorization Bypass in Next.js Middleware
Summary
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.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-08 15:16 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version
vercel next.js Affected: >= 11.1.4, < 12.3.5
Affected: >= 14.0.0, < 14.2.25
Affected: >= 15.0.0, < 15.2.3
Affected: >= 13.0.0, < 13.5.9
Create a notification for this product.
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: cfff0f14-96ea-4bab-8ddc-890cf7ccb4b3

Vulnerability ID: CVE-2025-29927

Status: Confirmed

Status Updated: 2025-12-15 15:29 CET

Exploited: Yes

Timestamps
First Seen: 2025-12-15
Asserted: 2025-12-15
Scope
Notes: Authorization Bypass in Next.js Middleware | Affected: Vercel / next.js | CVSS: 9.1 (CRITICAL) | EPSS: 0.99225 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Authorization Bypass in Next.js Middleware
Cve Id CVE-2025-29927
Vendor Vercel
Ghsa Id GHSA-F82V-JWR5-MFFW
Product next.js
Added Date 2025-12-15T14:29:13.422Z
Cvss Score 9.1
Epss Score 0.99225
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.99936
Used In Malware unknown
Vulnerability Id CVE-2025-29927
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-10-02 09:09 CEST | Updated: 2026-10-02 09:09 CEST
Show details on NVD website
To clipboard 

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    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.