Vulnerability · Published Jun 12, 2026 · Assigned by GitHub_M

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

High 8.8

In plain English

A high-severity incorrect authorization in nuxt from nuxt. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.8High

Exploit odds (30 days)0.4%top 65.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	nuxt	4.4.7	GHSA-mm7m-92g8-7m47
npm	nuxt	3.21.7	GHSA-mm7m-92g8-7m47

Affected products (as reported)

Vendor	Product	Versions
nuxt	nuxt	>= 3.11.0, < 3.21.7>= 4.0.0, < 4.4.7

Weakness: CWE-178, CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

References

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