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CVE-2026-44573 is an authorization bypass vulnerability in Next.js affecting applications that use the Pages Router with internationalization (i18n) enabled and rely on middleware or proxy-based authorization for access control. In affected versions, locale-less requests to the internal data route for server-side rendered pages are not normalized to the logical page route before middleware matching occurs. As a result, requests to the unprefixed data endpoint can bypass middleware entirely and still return the JSON payload associated with protected pages. The exposed response can include server-side rendered page data and properties generated by server-side data fetching logic such as getServerSideProps. Affected versions are 12.2.0 through 15.5.15 and 16.0.0 through 16.2.4. The issue is fixed in 15.5.16 and 16.2.5.
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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.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.