High severity · published Jun 12, 2026
CVE-2026-53721
Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher
8.2
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NU
nuxt · nuxt
>= 3.11.0, < 3.21.7; >= 4.0.0, < 4.4.7 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53721
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53721
Patch
https://github.com/nuxt/nuxt/commit/07e39cd6f26e407b4192b7865bd17bc44536b9bb
Patch
https://github.com/nuxt/nuxt/commit/3f3e3fa7b5eec8e495f4f8ce0a54813a8875a11e
Mitigation
https://github.com/nuxt/nuxt/security/advisories/GHSA-mm7m-92g8-7m47
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