{"id":11623,"date":"2026-07-27T11:08:58","date_gmt":"2026-07-27T17:08:58","guid":{"rendered":"https:\/\/beaconlab.us\/?post_type=publicacion&#038;p=11623"},"modified":"2026-07-27T11:08:59","modified_gmt":"2026-07-27T17:08:59","slug":"alerta-2026-77-vulnerabilidad-critica-en-ad-cs-con-poc-publica","status":"publish","type":"publicacion","link":"https:\/\/beaconlab.us\/es\/publicacion\/alerta-2026-77-vulnerabilidad-critica-en-ad-cs-con-poc-publica\/","title":{"rendered":"Alerta 2026-77 Vulnerabilidad Cr\u00edtica en AD CS con PoC P\u00fablica"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Producto(s) afectado(s):&nbsp;<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Windows Server 2012<\/li>\n\n\n\n<li>Windows Server 2012 R2<\/li>\n\n\n\n<li>Windows Server 2016<\/li>\n\n\n\n<li>Windows Server 2019<\/li>\n\n\n\n<li>Windows Server 2022<\/li>\n\n\n\n<li>Windows Server 2025<\/li>\n\n\n\n<li>Windows Server (Server Core)<\/li>\n\n\n\n<li>Windows 10 versi\u00f3n 1607<\/li>\n\n\n\n<li>Windows 10 versi\u00f3n 1809<\/li>\n\n\n\n<li>Entornos que utilicen Active Directory Certificate Services (AD CS) con una Enterprise CA.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Descripci\u00f3n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Se ha divulgado una vulnerabilidad cr\u00edtica identificada como <strong>CVE-2026-54121 (CVSS 8.8)<\/strong>, conocida como <strong>Certighost<\/strong>, que afecta a <strong>Active Directory Certificate Services (AD CS)<\/strong>. La falla permite que un usuario autenticado con privilegios m\u00ednimos obtenga un certificado v\u00e1lido para suplantar la identidad de un <strong>Controlador de Dominio (Domain Controller)<\/strong>. Una vez autenticado como dicho controlador mediante <strong>PKINIT<\/strong>, el atacante puede ejecutar un ataque <strong>DCSync<\/strong> para extraer el secreto <strong>KRBTGT<\/strong>, comprometiendo por completo el dominio de Active Directory. Aunque Microsoft indic\u00f3 inicialmente que la explotaci\u00f3n era poco probable, actualmente existe una <strong>prueba de concepto (PoC) p\u00fablica y funcional<\/strong>, lo que incrementa significativamente el riesgo para las organizaciones que a\u00fan no han aplicado las actualizaciones de seguridad.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Soluci\u00f3n:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Se recomienda implementar las siguientes acciones de forma inmediata:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Aplicar las <strong>actualizaciones de seguridad de Microsoft publicadas el 14 de julio de 2026<\/strong> en todos los servidores que ejecuten <strong>Active Directory Certificate Services (AD CS)<\/strong>.<\/li>\n\n\n\n<li>Si no es posible aplicar el parche de inmediato, Microsoft y los investigadores recomiendan, \u00fanicamente como medida temporal y tras validarla en un entorno controlado, deshabilitar la funcionalidad de chase ejecutando:<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">certutil -setreg policy\\EditFlags -EDITF_ENABLECHASECLIENTDC<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Restart-Service CertSvc -Force<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Importante<\/strong>: Esta mitigaci\u00f3n puede afectar los procesos leg\u00edtimos de emisi\u00f3n de certificados y no sustituye la instalaci\u00f3n de las actualizaciones de seguridad.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Informaci\u00f3n adicional:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/thehackernews.com\/2026\/07\/certighost-exploit-lets-low-privileged.html\">Certighost Exploit Lets Low-Privileged Active Directory Users Impersonate a Domain Controller<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.cisa.gov\/known-exploited-vulnerabilities-catalog\">Known Exploited Vulnerabilities Catalog | CISA<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2026-54121\">CVE-2026-54121 &#8211; Security Update Guide &#8211; Microsoft &#8211; Active Directory Certificate Services Elevation of Privilege Vulnerability<\/a><\/li>\n<\/ul>\n","protected":false},"featured_media":10963,"template":"","class_list":["post-11623","publicacion","type-publicacion","status-publish","has-post-thumbnail","hentry"],"acf":{"activar_pdf_link":false,"pdf":null,"numero_de_boletin":"","traffic_light_protocol":"Amber"},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Producto(s) afectado(s): Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025 Windows Server (Server Core) Windows 10 versi\u00f3n 1607 Windows 10 versi\u00f3n 1809 Entornos que utilicen Active Directory Certificate Services (AD CS) con una Enterprise CA. Descripci\u00f3n Se ha divulgado una vulnerabilidad cr\u00edtica identificada como\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/beaconlab.us\/es\/publicacion\/alerta-2026-77-vulnerabilidad-critica-en-ad-cs-con-poc-publica\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.9\" \/>\n\t\t<meta property=\"og:locale\" content=\"es_ES\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Beacon Lab - CSIRT by Cybolt\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Alerta 2026-77 Vulnerabilidad Cr\u00edtica en AD CS con PoC P\u00fablica - Beacon Lab\" \/>\n\t\t<meta property=\"og:description\" content=\"Producto(s) afectado(s): Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Server 2025 Windows Server (Server Core) Windows 10 versi\u00f3n 1607 Windows 10 versi\u00f3n 1809 Entornos que utilicen Active Directory Certificate Services (AD CS) con una Enterprise CA. 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