CVE-2026-10585

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The AnsweredQuestionStructuredDataComponent did not escape user-controlled Discussion titles before embedding them in a <script type=\"application/ld+json\"> block, allowing the title to break out of the script context. The injection was escalated to a full cross-site scripting attack on GitHub Enterprise Server by leveraging JSONP callback support in the REST API to bypass the Content Security Policy. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. This vulnerability was reported via the GitHub Bug Bounty program."}, {"lang": "es", "value": "Una vulnerabilidad de cross-site scripting almacenado fue identificada en GitHub Enterprise Server que permit\u00eda a un atacante autenticado ejecutar JavaScript arbitrario en el navegador de otro usuario inyectando una carga \u00fatil manipulada en el t\u00edtulo de una Discusi\u00f3n en la categor\u00eda de Preguntas y Respuestas. El AnsweredQuestionStructuredDataComponent no escapaba los t\u00edtulos de Discusi\u00f3n controlados por el usuario antes de incrustarlos en un bloque [script_tag], permitiendo que el t\u00edtulo saliera del contexto del script. La inyecci\u00f3n fue escalada a un ataque completo de cross-site scripting en GitHub Enterprise Server aprovechando el soporte de devoluci\u00f3n de llamada JSONP en la API REST para eludir la Pol\u00edtica de Seguridad de Contenido. Esta vulnerabilidad afect\u00f3 a todas las versiones de GitHub Enterprise Server anteriores a la 3.21 y fue corregida en las versiones 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. Esta vulnerabilidad fue reportada a trav\u00e9s del programa de recompensas por errores de GitHub."}], "id": "CVE-2026-10585", "lastModified": "2026-10-25T21:10:00.770", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.4, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 2.7, "source": "nvd@nist.gov", "type": "Primary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.3, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "PASSIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "product-cna@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-10585", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-01T15:36:51.127934Z", "version": "2.0.3"}}]}, "published": "2026-06-30T22:16:45.483", "references": [{"source": "product-cna@github.com", "tags": ["Release Notes"], "url": "https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.20"}, {"source": "product-cna@github.com", "tags": ["Release Notes"], "url": "https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.17"}, {"source": "product-cna@github.com", "tags": ["Release Notes"], "url": "https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.11"}, {"source": "product-cna@github.com", "tags": ["Release Notes"], "url": "https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.8"}, {"source": "product-cna@github.com", "tags": ["Release Notes"], "url": "https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.4"}], "sourceIdentifier": "product-cna@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-79"}], "source": "product-cna@github.com", "type": "Secondary"}]}

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