Incorrect Authorization Affecting next package, versions >=12.2.0 <15.5.16>=16.0.0-beta.0 <16.2.5
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- published11 May 2026
- disclosed11 May 2026
- creditUnknown
Introduced: 11 May 2026
NewCVE-2026-44573 (opens in a new tab)How to fix?
Upgrade next to version 15.5.16, 16.2.5 or higher.
Overview
next is a react framework.
Affected versions of this package are vulnerable to Incorrect Authorization in the /_next/data/<buildId>/<page>.json route when i18n is configured and authorization is enforced via middleware or proxy. An attacker can gain unauthorized access to sensitive server-side-rendered JSON data for protected pages by making locale-less requests that bypass the intended authorization checks.
Workaround
This vulnerability can be mitigated by enforcing authorization within the page's server-side data path rather than relying solely on middleware.