CVE-2025-30218
1.7
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
Summary
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| vercel | next.js | = 12.3.5 | affected |
| vercel | next.js | = 13.5.9 | affected |
| vercel | next.js | = 14.2.25 | affected |
| vercel | next.js | = 15.2.3 | affected |
Weaknesses
- CWE-200: CWE-200: Exposure of Sensitive Information to an Unauthorized Actor
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
- https://github.com/vercel/next.js/security/advisories/GHSA-223j-4rm8-mrmf
- https://vercel.com/changelog/cve-2025-30218-5DREmEH765PoeAsrNNQj3O
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