CVE-2025-30218

LOW EPSS 28.9%
Published Apr 2, 20251y ago · Modified Jun 17, 20261w ago
1.7 CVSS 4.0
Low
Find Similar
Published Apr 2, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

Description

Next.js is a React framework for building full-stack web applications. To mitigate CVE-2025-29927, Next.js validated the x-middleware-subrequest-id which persisted across multiple incoming requests. However, this subrequest ID is sent to all requests, even if the destination is not the same host as the Next.js application. Initiating a fetch request to a third-party within Middleware will send the x-middleware-subrequest-id to that third party. This vulnerability is fixed in 12.3.6, 13.5.10, 14.2.26, and 15.2.4.

CVSS Details

Base Score
1.7
Exploitability
—
Impact
—
Vector string
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
28.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available

Weaknesses 1

CWE-200 Exposure of Sensitive Information to an Unauthorized Actor Information Exposure

Affected Products 4

VendorProductVersionRange
vercelnext.js12.3.5any
vercelnext.js13.5.9any
vercelnext.js14.2.25any
vercelnext.js15.2.3any

References 2

  • github.com https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
    Vendor Advisory
  • vercel.com https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
    Vendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.