Medium severity · published Jun 12, 2026
CVE-2026-49993
@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)
5.7
CVSS
0.3%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Attack vector
Adjacent
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 20% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NU
nuxt · nuxt
>= 3.15.4, < 3.21.7; >= 4.0.0, < 4.4.7 · source: vendor
NU
Nuxt/rspack-builder · Nuxt
3.15.4 before 3.21.7; 4.0.0 before 4.4.7 · source: NVD
NU
Nuxt/webpack-builder · Nuxt
3.15.4 before 3.21.7; 4.0.0 before 4.4.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49993
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49993
Patch
https://github.com/nuxt/nuxt/commit/77187ee4015e9267fb464951542a3e09e8b5fa05
Patch
https://github.com/nuxt/nuxt/commit/e351de943e82db16970618b60dc7fdbaa58630f3
Issue Tracking
https://github.com/nuxt/nuxt/pull/35200
Exploit
https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g
Exploit
https://github.com/nuxt/nuxt/security/advisories/GHSA-x6qj-4h56-5rj5
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