CVE-2026-71315

Nuxt route rules silently dropped for mixed-case paths, bypassing appMiddleware auth gates (incomplete fix for CVE-2026-53721)

Workarounds

If you cannot upgrade immediately, any one of:

• Key all routeRules (and name your page files) in lowercase, so the keys already match the folded lookup path.
• Set router: { options: { sensitive: true } } so routing and route-rule matching are both case-sensitive and exact (requests must then use the exact casing).
• Enforce the sensitive protections server-side independently of route rules (for example a server middleware that checks auth), which does not rely on case-insensitive route-rule matching.

Nuxt matches route rules case-insensitively by default (mirroring vue-router's default sensitive: false routing). The fix for GHSA-mm7m-92g8-7m47 / CVE-2026-53721 lowercased the lookup path before matching route rules, but the route-rule keys compiled into the matcher were left verbatim. As a result, any route rule whose key contains an uppercase character (for example /Admin, /Dashboard/**, or the rules Nuxt derives from PascalCase/camelCase page files such as pages/Admin.vue) never matches, because every lookup is folded to lowercase while the key stays mixed-case.

vue-router still serves the page case-insensitively, so the page renders with none of its Nuxt route-rule protections applied. The most serious consequence is an authorization bypass: an appMiddleware rule used as an auth gate (routeRules: { '/Admin/dashboard': { appMiddleware: 'auth' } }) is dropped, and /Admin/dashboard, /admin/dashboard, and /ADMIN/dashboard all render the protected page (and its SSR-fetched data) to an unauthenticated visitor instead of redirecting to login. The same gap drops Nuxt's other app-side route-rule behaviours for mixed-case keys, including the client redirect middleware, the app-side ssr: false decision, prerender, and payload handling.

The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions. Typical impact: unauthorized data access or execution of privileged operations.

CVE-2026-71315 has a CVSS score of 8.2 (High). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (4.5.1, 3.21.10); upgrading removes the vulnerable code path.

Kodem intelligence

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Fixed in [email protected] (4.x) and [email protected] (3.x). The route-rule matcher now case-folds the compiled keys the same way it folds the lookup path, so key and lookup normalisation are symmetric. Both sides are gated on router.options.sensitive: with sensitive: true (case-sensitive routing) configured casing is preserved on both sides.

Scope note: server-emitted per-route headers, server redirect, and proxy are matched by Nitro's own case-sensitive route-rule matcher, not by Nuxt's app-level matcher. They are unchanged by this advisory. The fix covers the app-level protections Nuxt owns (appMiddleware, appLayout, the client redirect middleware, the app ssr decision, prerender, and payload).

1. What is CVE-2026-71315? CVE-2026-71315 is a high-severity incorrect authorization vulnerability in nuxt (npm), affecting versions >= 4.4.7, < 4.5.1. It is fixed in 4.5.1, 3.21.10. The application does not correctly enforce access controls, allowing a principal to access resources or operations beyond their granted permissions.
2. How severe is CVE-2026-71315? CVE-2026-71315 has a CVSS score of 8.2 (High). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of nuxt are affected by CVE-2026-71315? nuxt (npm) versions >= 4.4.7, < 4.5.1 is affected.
4. Is there a fix for CVE-2026-71315? Yes. CVE-2026-71315 is fixed in 4.5.1, 3.21.10. Upgrade to this version or later.
5. Is CVE-2026-71315 exploitable, and should I be worried? Whether CVE-2026-71315 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-71315 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-71315?
   • Upgrade nuxt to 4.5.1 or later
   • Upgrade nuxt to 3.21.10 or later

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