{"id":"CVE-2026-49993","state":"PUBLISHED","title":"@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)","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.","publishedAt":"2026-06-12T12:57:43.232Z","updatedAt":"2026-06-12T13:42:21.829Z","severity":{"score":5.9,"label":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["nuxt nuxt"],"affected":[{"vendor":"nuxt","product":"nuxt","versions":[{"version":">= 3.15.4, < 3.21.7","status":"affected"},{"version":">= 4.0.0, < 4.4.7","status":"affected"}]}],"references":["https://github.com/nuxt/nuxt/security/advisories/GHSA-x6qj-4h56-5rj5","https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g","https://github.com/nuxt/nuxt/pull/35200","https://github.com/nuxt/nuxt/commit/77187ee4015e9267fb464951542a3e09e8b5fa05","https://github.com/nuxt/nuxt/commit/e351de943e82db16970618b60dc7fdbaa58630f3"],"weaknesses":["CWE-749"],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/49xxx/CVE-2026-49993.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49993","state":"PUBLISHED","datePublished":"2026-06-12T12:57:43.232Z","dateUpdated":"2026-06-12T13:42:21.829Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-02T18:30:51.283Z"},"containers":{"cna":{"title":"@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)","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"nuxt","product":"nuxt","versions":[{"version":">= 3.15.4, < 3.21.7","status":"affected"},{"version":">= 4.0.0, < 4.4.7","status":"affected"}]}],"references":[{"url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-x6qj-4h56-5rj5","name":"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","name":"https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g","tags":["x_refsource_MISC"]},{"url":"https://github.com/nuxt/nuxt/pull/35200","name":"https://github.com/nuxt/nuxt/pull/35200","tags":["x_refsource_MISC"]},{"url":"https://github.com/nuxt/nuxt/commit/77187ee4015e9267fb464951542a3e09e8b5fa05","name":"https://github.com/nuxt/nuxt/commit/77187ee4015e9267fb464951542a3e09e8b5fa05","tags":["x_refsource_MISC"]},{"url":"https://github.com/nuxt/nuxt/commit/e351de943e82db16970618b60dc7fdbaa58630f3","name":"https://github.com/nuxt/nuxt/commit/e351de943e82db16970618b60dc7fdbaa58630f3","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-749","lang":"en","description":"CWE-749: Exposed Dangerous Method or Function","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-06-12T12:57:43.232Z"},"source":{"advisory":"GHSA-x6qj-4h56-5rj5","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-6m52-m754-pw2g","tags":["exploit"]},{"url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-x6qj-4h56-5rj5","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-12T13:42:10.549608Z","id":"CVE-2026-49993","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-12T13:42:21.829Z"}}]}}}