What’s Vulnerable › Vulnerabilities

CVE-2026-53721: Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-12 · updated 2026-06-17
• Weakness: CWE-178

Description

Nuxt is an open-source web development framework for Vue.js. From versions 3.11.0 to before 3.21.7 and 4.0.0 to before 4.4.7, there is a route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher. This issue has been patched in versions 3.21.7 and 4.4.7.

Affected products

• nuxt: from 3.11.0 before 3.21.7; from 4.0.0 before 4.4.7 — fixed in 3.21.7, 4.4.7

How to fix

Upgrade to a fixed version: nuxt 3.21.7, 4.4.7. Check the vendor advisory for mitigations.

References

• https://github.com/nuxt/nuxt/commit/07e39cd6f26e407b4192b7865bd17bc44536b9bb
• https://github.com/nuxt/nuxt/commit/3f3e3fa7b5eec8e495f4f8ce0a54813a8875a11e
• https://github.com/nuxt/nuxt/security/advisories/GHSA-mm7m-92g8-7m47

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