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In Next.js App Router applications built with webpack, metadata image routes such as opengraph-image and twitter-image ignore the dynamicParams route segment option. An attacker can request metadata image URLs for dynamic segments that were deliberately excluded from generateStaticParams(). This flaw allows unauthorized access to dynamic route contents that were expected to remain hidden or ungenerated. Specifically, when applications utilize webpack configurations alongside static generation restrictions, the routing logic fails to properly evaluate dynamicParams boundaries for image generation handlers. Consequently, malicious actors can systematically probe and retrieve sensitive information or media assets associated with restricted segments. The vulnerability compromises the data isolation guarantees intended by developers who explicitly configured exclusion parameters for their dynamic routing segments. Exploitation relies entirely on targeting these specific metadata image endpoints directly via crafted HTTP requests. Vercel addressed this issue in security updates by ensuring dynamicParams restrictions are correctly enforced across all metadata image routes during webpack compilations.
DailyCVE Form:
Platform: Next.js
Version: 16.0.0-16.3.7
Vulnerability : Information Disclosure
Severity : Medium
Date : September 30, 2026
Prediction : September 30, 2026
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Bash Commands and Codes
npm install [email protected] npm run build
Exploit: (Educational Purposes!)
curl -I https://vulnerable-site.com/blog/hidden-segment/opengraph-image
Protection:
Upgrade Next.js to version 16.3.8 or later to ensure dynamicParams are properly respected by webpack metadata image routes.
Impact:
Attackers can bypass intended static generation constraints to harvest sensitive content from hidden or unrendered dynamic route metadata segments.
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Sources:
Reported By: github.com
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