Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5.
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Wed, 13 May 2026 18:45:00 +0000
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Vercel
Vercel next.js |
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Vercel
Vercel next.js |
Wed, 13 May 2026 18:30:00 +0000
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ssvc
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Wed, 13 May 2026 17:15:00 +0000
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| Description | Next.js is a React framework for building full-stack web applications. From 15.2.0 to before 15.5.16 and 16.2.5, App Router applications that rely on middleware or proxy-based checks for authorization can allow unauthorized access through transport-specific route variants used for segment prefetching. In affected configurations, specially crafted .rsc and segment-prefetch URLs can resolve to the same page without being matched by the intended middleware rule, which can allow protected content to be reached without the expected authorization check. This vulnerability is fixed in 15.5.16 and 16.2.5. | |
| Title | Next.js: Middleware / Proxy bypass in App Router applications via segment-prefetch routes | |
| Weaknesses | CWE-288 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-05-13T17:50:24.865Z
Reserved: 2026-05-06T21:49:12.424Z
Link: CVE-2026-44575
Updated: 2026-05-13T17:50:20.144Z
Status : Awaiting Analysis
Published: 2026-05-13T17:16:22.907
Modified: 2026-05-13T17:25:25.693
Link: CVE-2026-44575
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