Case-Sensitive Route Rules Bypass in Nuxt.js

Publication date: 2026-08-05

Last updated on: 2026-08-05

Assigner: GitHub, Inc.

Description

Nuxt is an open-source web development framework for Vue.js. From 3.21.7 until 3.21.10 and 4.5.1, mixed-case routeRules keys can fail to match case-folded lookups when router.options.sensitive is false and drop appMiddleware authorization gates. This is caused by an incomplete fix for CVE-2026-53721. This issue is fixed in 3.21.10 and 4.5.1.

CVSS Scores

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Meta Information

Published

2026-08-05

Last Modified

2026-08-05

Generated

2026-08-06

AI Q&A

2026-08-06

EPSS Evaluated

N/A

NVD

CVE-2026-71315

Affected Vendors & Products

Vendor	Product	Version / Range
nuxt	nuxt	to 3.21.10 (inc)
nuxt	nuxt	4.5.1

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.
CWE-178	The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.

Attack-Flow Graph

Executive Summary

This vulnerability affects the Nuxt framework, a web development tool for Vue.js. It occurs when mixed-case routeRules keys fail to match case-folded lookups if router.options.sensitive is false. This can cause appMiddleware authorization gates to be dropped, potentially bypassing security checks.

Impact Analysis

If exploited, this flaw could allow unauthorized access to restricted routes or bypass security controls like authentication gates. Attackers might manipulate route rules to gain unintended access to parts of an application, compromising data or functionality.

Mitigation Strategies

Upgrade Nuxt to version 3.21.10 or 4.5.1 or later to address the issue with mixed-case routeRules keys and middleware authorization gates.

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