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CVE-2026-45670— Nuxt: Dev server exposes built source over LAN to malicious sites (incomplete fix for GHSA-4gf7-ff8x-hq99)

Quick assessment

Affected
nuxt nuxt
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Nuxt是Nuxt团队开源的一个免费的开源框架。 nuxt 3.15.4至3.21.6之前版本和4.0.0-alpha.1至4.4.6之前版本存在权限许可和访问控制问题漏洞，该漏洞源于对先前安全修复的不完整修复，可能导致开发服务器绑定到非回环地址时，开发者在同一网络打开恶意站点从而导致源代码泄露。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.37% · P28

Affected Version Matrix 2

VendorProduct Version RangeStatus
nuxt nuxt >= 3.15.4, < 3.21.6 affected
>= 4.0.0-alpha.1, < 4.4.6 affected
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I. Basic Information for CVE-2026-45670

Vulnerability Information
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Vulnerability Title
Nuxt: Dev server exposes built source over LAN to malicious sites (incomplete fix for GHSA-4gf7-ff8x-hq99)
Source: CVE Program / CVE List V5
Vulnerability Description
Nuxt is an open-source web development framework for Vue.js. In @nuxt/rspack-builder and @nuxt/webpack-builder versions 3.15.4 to before 3.21.6, and 4.0.0-alpha.1 to before 4.4.6, there is an incomplete fix for GHSA-4gf7-ff8x-hq99. Source code may be stolen during dev when using the webpack / rspack builder if the dev server is bound to a non-loopback address (e.g. nuxt dev --host) and the developer opens a malicious site on the same network. This issue has been patched in versions 3.21.6 and 4.4.6.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
暴露危险的方法或函数
Source: CVE Program / CVE List V5
Vulnerability Title
Nuxt 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nuxt是Nuxt团队开源的一个免费的开源框架。 nuxt 3.15.4至3.21.6之前版本和4.0.0-alpha.1至4.4.6之前版本存在权限许可和访问控制问题漏洞，该漏洞源于对先前安全修复的不完整修复，可能导致开发服务器绑定到非回环地址时，开发者在同一网络打开恶意站点从而导致源代码泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
nuxt nuxt >= 3.15.4, < 3.21.6 -

II. Public POCs for CVE-2026-45670

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III. Intelligence Information for CVE-2026-45670

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Patches & Fixes for CVE-2026-45670 (1)

Vendor Advisories for CVE-2026-45670 (2)

Same Patch Batch · nuxt · 2026-06-12 · 7 CVEs total

CVE-2026-53721 Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and th
CVE-2026-53722 Nuxt: Reflected XSS in `<NuxtLink>` via unsanitised `javascript:` or `data:` URL
CVE-2026-45669 Nuxt: Reflected XSS in `navigateTo()` external redirect
CVE-2026-47200 Nuxt: Route middleware not enforced when rendering `.server.vue` pages via `/__nuxt_island
CVE-2026-49993 @nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when
CVE-2026-46342 Nuxt: `__nuxt_island` endpoint does not bind responses to request props, enabling shared-c

IV. Related Vulnerabilities

Same product: nuxt
Same vendor: nuxt
Same weakness: CWE-749

V. Comments for CVE-2026-45670

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