GHSA-36qx-fr4f-26g5
Next.js has a Middleware / Proxy bypass in Pages Router applications using i18n
Quick fix
GHSA-36qx-fr4f-26g5 — next: upgrade to the fixed version with the command below.
npm install next@15.5.16Details
### Impact
Applications using the Pages Router with `i18n` configured and middleware/proxy-based authorization can allow unauthorized access to protected page data through locale-less `/_next/data/<buildId>/<page>.json` requests. In affected configurations, middleware does not run for the unprefixed data route, allowing an attacker to retrieve SSR JSON for protected pages without passing the intended authorization checks.
### Fix The matcher logic was updated to perform the same match as it would on a non-i18n data route.
### Workarounds
If you cannot upgrade immediately, enforce authorization in the page's server-side data path instead of relying solely on middleware.
Are you affected?
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