{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-53721: Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-53721","status":"final","version":"1","initial_release_date":"2026-06-12T13:41:34.022Z","current_release_date":"2026-06-13T02:59:37.902Z","revision_history":[{"date":"2026-06-12T13:41:34.022Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Nuxt is an open-source web development framework for Vue.js. From versions 3.11.0 to before 3.21.7 and 4.0.0 to before 4.4.7, there is a route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher. This issue has been patched in versions 3.21.7 and 4.4.7.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-53721 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-53721"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-53721"},{"category":"external","summary":"https://github.com/nuxt/nuxt/security/advisories/GHSA-mm7m-92g8-7m47","url":"https://github.com/nuxt/nuxt/security/advisories/GHSA-mm7m-92g8-7m47"},{"category":"external","summary":"https://github.com/nuxt/nuxt/commit/07e39cd6f26e407b4192b7865bd17bc44536b9bb","url":"https://github.com/nuxt/nuxt/commit/07e39cd6f26e407b4192b7865bd17bc44536b9bb"},{"category":"external","summary":"https://github.com/nuxt/nuxt/commit/3f3e3fa7b5eec8e495f4f8ce0a54813a8875a11e","url":"https://github.com/nuxt/nuxt/commit/3f3e3fa7b5eec8e495f4f8ce0a54813a8875a11e"}]},"product_tree":{"branches":[{"category":"vendor","name":"nuxt","branches":[{"category":"product_name","name":"nuxt","branches":[{"category":"product_version","name":">= 3.11.0, < 3.21.7","product":{"name":"nuxt nuxt >= 3.11.0, < 3.21.7","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:nuxt:nuxt:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":">= 4.0.0, < 4.4.7","product":{"name":"nuxt nuxt >= 4.0.0, < 4.4.7","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:nuxt:nuxt:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-53721","title":"Nuxt: Route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher","notes":[{"category":"description","text":"Nuxt is an open-source web development framework for Vue.js. From versions 3.11.0 to before 3.21.7 and 4.0.0 to before 4.4.7, there is a route-rule middleware bypass via case-sensitivity mismatch between vue-router and the routeRules matcher. This issue has been patched in versions 3.21.7 and 4.4.7.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-2"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N","baseScore":8.8,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-2"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1","CSAFPID-2"]}]}]}