CVE-2026-49993CWE-749

@nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent (incomplete fix for GHSA-6m52-m754-pw2g)

Medium · published June 12, 2026

CVSS v4.0
5.9
EPSS
0%
Percentile
22.5
In the wild
Unconfirmed
What it is

Nuxt is an open-source web development framework for Vue.js. In @nuxt/rspack-builder and @nuxt/webpack-builder from versions 3.15.4 to before 3.21.7 and 4.0.0 to before 4.4.7, there is an incomplete fix for GHSA-6m52-m754-pw2g. Source code may still 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 3.21.7 and 4.4.7.

The record
Technical detail
CVSS v4.0
5.9 · MEDIUM
Vector
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
EPSS
0.00309 · 22.5th percentile
Weakness
CWE-749 · Exposed Dangerous Method or Function
Published
2026-06-12T12:57Z
EPSS history
Timeline
  • 12 JUN 12:57Z
    @nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and Referer are all absent (incomplete fix for GHSA-6m52-m754-pw2g)
    cvelistv5