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CVE-2026-44575 is an authorization bypass vulnerability in Next.js App Router applications. Affected applications that depend on middleware or proxy-based authorization checks can expose protected content through alternate transport-specific route variants used for React Server Components and segment prefetching. The flaw is caused by incomplete middleware matcher handling, where canonical protected routes are matched but certain App Router variants, including .rsc and segment-prefetch forms, can resolve to the same page without triggering the intended middleware rule. As a result, an unauthenticated requester can reach content that should have been gated by middleware-based access control. Reported affected versions include Next.js 15.2.0 through 15.5.15 and 16.0.0 through 16.2.4, with broader reporting also indicating affected 13.x and 14.x lines in App Router deployments relying solely on middleware for authorization.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An unauthorized access vulnerability in Next.js via middleware bypass.
An authentication bypass vulnerability in Next.js App Router middleware matching that allows unauthenticated access to protected pages via alternate transport URL variants such as .rsc and segment-prefetch paths.
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.