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Next.js Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2025-30218 - Vulnerability Database
Next.js

Next.js Exposure of Sensitive Information to an Unauthorized Actor Vulnerability - CVE-2025-30218

Medium
Reference: CVE-2025-30218
NVD Link: https://nvd.nist.gov/vuln/detail/CVE-2025-30218
Title: Next.js Exposure of Sensitive Information to an Unauthorized Actor Vulnerability
Overview:

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.