CVE-2026-71318: Input Validation Flaw (CVSS 4.8)

Description

Nuxt is an open-source web development framework for Vue.js. From 3.1.0 until 3.21.10 and 4.5.1, an attacker can supply a top-level `as` prop to the /__nuxt_island/ endpoint and drive dynamic component resolution through <component :is>, resolveDynamicComponent, or h(). This issue is fixed in 3.21.10 and 4.5.1.

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CVSS v3.1 Score

4.8

MEDIUM

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

Weakness Type (CWE)

CWE-20 Improper Input Validation

References

Other References

https://github.com/nuxt/nuxt/releases/tag/v3.21.10 https://github.com/nuxt/nuxt/releases/tag/v4.5.1 https://github.com/nuxt/nuxt/security/advisories/GHSA-48hr-524c-v5w3

Frequently Asked Questions

What is CVE-2026-71318? +

Nuxt is an open-source web development framework for Vue.js. From 3.1.0 until 3.21.10 and 4.5.1, an attacker can supply a top-level `as` prop to the /__nuxt_island/ endpoint and drive dynamic component resolution through <component :is>, resolveDynamicComponent, or h(). This issue is fixed in 3.21.10 and 4.5.1. It has a CVSS v3.1 base score of 4.8 (MEDIUM).

How severe is CVE-2026-71318? +

CVE-2026-71318 has a CVSS v3.1 score of 4.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-71318? +

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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