{"id":"CVE-2026-49993","published":"2026-06-12T12:57:43Z","modified":"2026-06-12T13:42:21Z","title":"@nuxt/webpack-builder and @nuxt/rspack-builder dev server same-origin check bypassed when Sec-Fetch-Site, Origin, and…","vendor":"nuxt","product":"nuxt","tier":"tail","description":{"text":"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.","provenance":"source","from":"CVE.org"},"cvss":{"score":5.9,"severity":"MEDIUM","version":"4.0","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","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.0028,"percentile":0.20476,"provenance":"source"},"cwes":[{"id":"CWE-749","name":"Exposed Dangerous Method or Function"}],"references":[{"url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-x6qj-4h56-5rj5","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g","tags":["x_refsource_MISC"]},{"url":"https://github.com/nuxt/nuxt/pull/35200","tags":["x_refsource_MISC"]},{"url":"https://github.com/nuxt/nuxt/commit/77187ee4015e9267fb464951542a3e09e8b5fa05","tags":["x_refsource_MISC"]},{"url":"https://github.com/nuxt/nuxt/commit/e351de943e82db16970618b60dc7fdbaa58630f3","tags":["x_refsource_MISC"]}],"priority":{"score":8.2,"factors":[{"name":"EPSS percentile","points":4.1},{"name":"CVSS severity","points":4.13}]},"vendorSlug":"nuxt","affectedVersions":[{"vendor":"nuxt","product":"nuxt","versions":[">= 3.15.4, < 3.21.7",">= 4.0.0, < 4.4.7"]}],"affected":[{"ecosystem":"npm","package":"@nuxt/webpack-builder","vulnerableRanges":[">=4.0.0, <4.4.7",">=3.15.4, <3.21.7"],"patched":["4.4.7","3.21.7"],"from":["GHSA-x6qj-4h56-5rj5"],"provenance":"source"},{"ecosystem":"npm","package":"@nuxt/rspack-builder","vulnerableRanges":[">=4.0.0, <4.4.7",">=3.15.4, <3.21.7"],"patched":["4.4.7","3.21.7"],"from":["GHSA-x6qj-4h56-5rj5"],"provenance":"source"}],"euvd":{"id":"EUVD-2026-36421","exploited":false,"provenance":"source"},"lineage":{"familyId":"fam-nuxt-cve-2025-24361","parents":[{"from":"CVE-2026-45670","to":"CVE-2026-49993","relation":"successor","confidence":"high","kind":"lineage","orderedBy":"description","evidence":[{"kind":"osv-related","provenance":"source","id":"GHSA-6m52-m754-pw2g","via":"related"},{"kind":"osv-related","provenance":"source","id":"GHSA-x6qj-4h56-5rj5","via":"reference","url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g"},{"kind":"version-step","provenance":"source","package":"npm:@nuxt/rspack-builder","fromFixed":"3.21.6","toFixed":"3.21.7","daysApart":0},{"kind":"version-step","provenance":"source","package":"npm:@nuxt/rspack-builder","fromFixed":"4.4.6","toFixed":"4.4.7","daysApart":0},{"kind":"similar","provenance":"machine","score":0.72,"basis":"same product + CWE + description similarity"}]}],"packageHistory":[{"cve":"CVE-2025-24361","published":"2025-01-25","fixed":"3.15.3","kev":false},{"cve":"CVE-2026-45670","published":"2026-06-12","fixed":"4.4.6","kev":false},{"cve":"CVE-2026-49993","published":"2026-06-12","fixed":"4.4.7","kev":false}],"package":"npm:@nuxt/rspack-builder"}}