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CVE-2026-44573 is an authorization bypass vulnerability in Next.js affecting applications that use the Pages Router with internationalization enabled and rely on middleware or proxy-based authorization for page protection. In affected versions, locale-less data-route requests to the internal server-side rendering JSON endpoint are not normalized back to the logical page route before middleware matching. As a result, requests for protected page data can avoid middleware execution entirely when made through an unprefixed data route. This allows a remote attacker to retrieve server-side rendered JSON for protected pages, including data generated by server-side page data fetching logic, without satisfying the intended authorization checks. Affected versions include 12.2.0 through 15.5.15 and 16.0.0 through 16.2.4. The issue was fixed by updating route matching so both localized and locale-less data requests are consistently mapped and subjected to middleware evaluation.
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An information disclosure vulnerability in Next.js caused by middleware bypass in Pages Router with i18n.
An authorization bypass vulnerability in Next.js middleware affecting Pages Router applications with internationalization enabled, allowing unauthenticated attackers to retrieve protected server-side rendered JSON page data by requesting locale-less /_next/data/ endpoints.
A middleware authorization bypass vulnerability in Next.js Pages Router with i18n enabled, where locale-less data route requests can bypass middleware and expose protected server-side rendered JSON.
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Cross-references every affected SKU, including bundled OEM variants.
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