Emerging Threat: (CVE-2026-53721) Nuxt Route-Rule Middleware Bypass via Case-Sensitivity Mismatch
CVE-2026-53721 is a route-rule middleware bypass in Nuxt, the open-source web development framework for Vue.js. It stems from a case-sensitivity mismatch between vue-router and the framework’s routeRules matcher, which lets an attacker reach a protected route by varying the casing of the request path. The vulnerability carries a CVSS v4.0 base score of 8.8 (High). Exploitation is pre-authentication and requires no user interaction.