CVE-2026-53721: nuxt Auth Bypass — Fix

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.

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CVSS v3.1 Score

8.2

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

EPSS — Exploit Prediction

0.0029

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-178 CWE-178

CWE-863 Incorrect Authorization

Affected Products

Vendor	Product	Versions
nuxt	nuxt	3.11.0 — 3.21.7
nuxt	nuxt	4.0.0 — 4.4.7

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2026-53721? +

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. It has a CVSS v3.1 base score of 8.2 (HIGH).

How severe is CVE-2026-53721? +

CVE-2026-53721 has a CVSS v3.1 score of 8.2 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0029, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-53721? +

CVE-2026-53721 affects products from nuxt, specifically: nuxt. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-53721? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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