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PatchSiren cyber security CVE debrief

CVE-2026-53721 nuxt CVE debrief

CVE-2026-53721 is a HIGH severity vulnerability in Nuxt, a Vue.js web development framework. Versions 3.11.0 to before 3.21.7 and 4.0.0 to before 4.4.7 are affected by a route-rule middleware bypass due to a case-sensitivity mismatch between vue-router and the routeRules matcher. This vulnerability was patched in versions 3.21.7 and 4.4.7.

Vendor
nuxt
Product
Unknown
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-12
Original CVE updated
2026-06-15
Advisory published
2026-06-12
Advisory updated
2026-06-15

Who should care

Developers and administrators using Nuxt versions 3.11.0 to before 3.21.7 and 4.0.0 to before 4.4.7 should be aware of this vulnerability and take steps to upgrade to a patched version.

Technical summary

The vulnerability is caused by a case-sensitivity mismatch between vue-router and the routeRules matcher in Nuxt. This allows for a route-rule middleware bypass, potentially leading to unauthorized access or other security issues.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Nuxt version 3.21.7 or later
  • Upgrade to Nuxt version 4.4.7 or later

Evidence notes

CVE-2026-53721 has a CVSS score of 8.8 and is classified as HIGH severity. The vulnerability was published on 2026-06-12T15:16:31.297Z and last modified on 2026-06-12T16:01:25.477Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-53721 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-53721

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-53721 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-53721

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.