CVE-2026-42221

{"id": "CVE-2026-42221", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-42221", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-05-05T14:06:26.362325Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.1, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.2}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "0xJacky", "product": "nginx-ui", "versions": [{"status": "affected", "version": ">= 2.0.0, < 2.3.8"}]}]}], "published": "2026-05-04T21:16:32.023", "references": [{"url": "https://github.com/0xJacky/nginx-ui/releases/tag/v2.3.8", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-h27v-ph7w-m9fp", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-306"}]}], "descriptions": [{"lang": "en", "value": "Nginx UI is a web user interface for the Nginx web server. From version 2.0.0 to before version 2.3.8, an unauthenticated network attacker can claim the initial administrator account on a fresh nginx-ui instance during the first-run setup window. The public /api/install endpoint is reachable without authentication, and the request-encryption flow only protects payload confidentiality in transit; it does not authenticate who is allowed to perform installation. A remote attacker who reaches the service before the legitimate operator can set the admin email, username, and password, causing permanent initial-instance takeover. This issue has been patched in version 2.3.8."}, {"lang": "es", "value": "Nginx UI es una interfaz de usuario web para el servidor web Nginx. Desde la versi\u00f3n 2.0.0 hasta antes de la versi\u00f3n 2.3.8, un atacante de red no autenticado puede reclamar la cuenta de administrador inicial en una instancia nueva de nginx-ui durante la ventana de configuraci\u00f3n de la primera ejecuci\u00f3n. El endpoint p\u00fablico /api/install es accesible sin autenticaci\u00f3n, y el flujo de cifrado de solicitudes solo protege la confidencialidad de la carga \u00fatil en tr\u00e1nsito; no autentica qui\u00e9n est\u00e1 autorizado para realizar la instalaci\u00f3n. Un atacante remoto que accede al servicio antes que el operador leg\u00edtimo puede establecer el correo electr\u00f3nico, nombre de usuario y contrase\u00f1a del administrador, causando una toma de control permanente de la instancia inicial. Este problema ha sido parcheado en la versi\u00f3n 2.3.8."}], "lastModified": "2026-10-26T19:10:00.163", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:nginxui:nginx_ui:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "623A6AFE-E1C3-4D21-9465-A33CB945AF6F", "versionEndExcluding": "2.3.8", "versionStartIncluding": "2.0.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}