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CVE-2026-44574 is an authorization bypass vulnerability in Next.js affecting applications that use the App Router and rely exclusively on middleware to protect dynamic routes. In vulnerable versions, externally supplied crafted query parameters can influence internal route parameter resolution so that the page handler processes a different dynamic route value than the one evaluated by middleware. This creates a trust-boundary mismatch between middleware authorization decisions based on the visible pathname and the route parameters ultimately consumed by the page. As a result, a request can appear to target an allowed public path while the application renders content associated with a protected dynamic route without the expected middleware check. Reported affected versions include Next.js 15.4.0 through 15.5.15 and 16.0.0 through 16.2.4. The issue was fixed by restricting internal route parameter handling to trusted routing flows and rejecting externally supplied parameter encodings from ordinary HTTP requests.
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An authorization bypass vulnerability in Next.js via crafted query parameters.
An authorization bypass vulnerability in Next.js affecting applications that use middleware to protect dynamic routes. Specially crafted query parameters can manipulate the dynamic route value seen by the page while bypassing the expected middleware authorization check.
A Next.js middleware authorization bypass in the App Router caused by trust boundary mismatch between middleware path inspection and App Router handling of internal routing parameters, allowing protected dynamic route content to be rendered without authorization.
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Cross-references every affected SKU, including bundled OEM variants.
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