CVE-2026-6657

{"id": "CVE-2026-6657", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-6657", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-03T17:24:16.863193Z"}}], "cvssMetricV30": [{"type": "Secondary", "source": "security@huntr.dev", "cvssData": {"scope": "CHANGED", "version": "3.0", "baseScore": 6.1, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.7, "exploitabilityScore": 2.8}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security@huntr.dev", "affectedData": [{"vendor": "jupyter", "product": "jupyter/jupyter", "versions": [{"status": "affected", "version": "unspecified", "versionType": "custom", "lessThanOrEqual": "latest"}]}]}], "published": "2026-06-03T16:16:31.710", "references": [{"url": "https://huntr.com/bounties/18f642db-3569-43b3-b58d-ff97be4b09d7", "tags": ["Exploit", "Third Party Advisory"], "source": "security@huntr.dev"}, {"url": "https://huntr.com/bounties/18f642db-3569-43b3-b58d-ff97be4b09d7", "tags": ["Exploit", "Third Party Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security@huntr.dev", "description": [{"lang": "en", "value": "CWE-346"}]}], "descriptions": [{"lang": "en", "value": "A vulnerability in jupyter-server versions 1.12.0 through 2.17.0 allows an attacker to bypass CORS origin validation when the `allow_origin_pat` configuration is used. The issue arises from the use of `re.match()` for validating the `Origin` header, which only anchors at the start of the string. This allows attacker-controlled domains such as `trusted.example.com.evil.com` to pass validation against patterns intended to match `trusted.example.com`. The vulnerability affects multiple locations in the codebase, including CORS headers, WebSocket connections, referer validation, and login redirects, potentially enabling phishing attacks, arbitrary code execution, and unauthorized access to sensitive API responses."}, {"lang": "es", "value": "Una vulnerabilidad en las versiones 1.12.0 a 2.17.0 de jupyter-server permite a un atacante eludir la validaci\u00f3n de origen CORS cuando se utiliza la configuraci\u00f3n 'allow_origin_pat'. El problema surge del uso de 're.match()' para validar el encabezado 'Origin', que solo se ancla al inicio de la cadena. Esto permite a dominios controlados por el atacante, como 'trusted.example.com.evil.com', pasar la validaci\u00f3n contra patrones destinados a coincidir con 'trusted.example.com'. La vulnerabilidad afecta m\u00faltiples ubicaciones en la base de c\u00f3digo, incluyendo encabezados CORS, conexiones WebSocket, validaci\u00f3n de referer y redirecciones de inicio de sesi\u00f3n, lo que podr\u00eda permitir ataques de phishing, ejecuci\u00f3n de c\u00f3digo arbitrario y acceso no autorizado a respuestas sensibles de la API."}], "lastModified": "2026-07-21T19:10:00.107", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:jupyter:jupyter_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "814D8004-898B-4939-A186-40885621404A", "versionEndIncluding": "2.17.0", "versionStartIncluding": "1.12.0"}], "operator": "OR"}]}], "sourceIdentifier": "security@huntr.dev"}