Improper Verification of Source of a Communication Channel Affecting @nuxt/webpack-builder package, versions >=3.15.4 <3.21.7>=4.0.0-alpha.1 <4.4.7
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-NUXTWEBPACKBUILDER-17337029
- published14 Jun 2026
- disclosed12 Jun 2026
- creditBerkan SAL, DavidCarliez
Introduced: 12 Jun 2026
NewCVE-2026-49993 (opens in a new tab)How to fix?
Upgrade @nuxt/webpack-builder to version 3.21.7, 4.4.7 or higher.
Overview
@nuxt/webpack-builder is a Webpack bundler for Nuxt
Affected versions of this package are vulnerable to Improper Verification of Source of a Communication Channel through the isSameOriginRequest check in the dev-server request handling path. An attacker can send a browser-originated request with Sec-Fetch-Site, Origin, and Referer all absent to reach a development server bound to a non-loopback address and trigger privileged dev-server actions. This lets a remote page issue requests against the developer’s running server and abuse local build, file, or control endpoints that the server exposes.
Workarounds
- Do not use
nuxt dev --host; keep the dev server bound tolocalhostand, if you need access from other devices, tunnel to it through SSH or a reverse proxy that enforces same-origin checks. - Switch to the Vite builder for development instead of the webpack or rspack builder.