[GHSA-f82v-jwr5-mffw] Authorization Bypass in Next.js Middleware#7074
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[GHSA-f82v-jwr5-mffw] Authorization Bypass in Next.js Middleware#7074Wenxin-Jiang wants to merge 1 commit intoWenxin-Jiang/advisory-improvement-7074from
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The vulnerability (CVE-2025-29927) is an authorization bypass via the
x-middleware-subrequestHTTP header, which is part of Next.js's middleware recursion prevention mechanism. This mechanism was introduced in Next.js 12.0.0 as part of the Middleware feature (October 2021). Version 11.1.4 (September 2021) predates the Middleware feature entirely.The vulnerable code path is:
x-middleware-subrequestheaderdist/server/web/sandbox/sandbox.jsreads the header and skips middleware if the value matchesIn
11.1.4, none of these files or functions exist. There is noweb/sandbox/directory, nosandbox.js, nox-middleware-subrequestheader handling, and no middleware execution runtime.