{"id":11691,"date":"2026-08-26T17:24:23","date_gmt":"2026-08-26T23:24:23","guid":{"rendered":"https:\/\/beaconlab.us\/?post_type=publicacion&#038;p=11691"},"modified":"2026-08-26T17:24:23","modified_gmt":"2026-08-26T23:24:23","slug":"alerta-2026-91-vulnerabilidad-de-elevacion-de-privilegios-en-microsoft-exchange-server","status":"publish","type":"publicacion","link":"https:\/\/beaconlab.us\/es\/publicacion\/alerta-2026-91-vulnerabilidad-de-elevacion-de-privilegios-en-microsoft-exchange-server\/","title":{"rendered":"Alerta 2026-91 Vulnerabilidad de elevaci\u00f3n de privilegios en Microsoft Exchange Server"},"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>Microsoft Exchange Server 2016 CU23 (x64): versiones desde 15.01.0.0 hasta antes de\u00a0<strong>15.01.2507.072<\/strong>.<\/li>\n\n\n\n<li>Microsoft Exchange Server 2019 CU14 (x64): versiones desde 15.02.0.0 hasta antes de\u00a0<strong>15.02.1544.044<\/strong>.<\/li>\n\n\n\n<li>Microsoft Exchange Server 2019 CU15 (x64): versiones desde 15.02.0.0 hasta antes de\u00a0<strong>15.02.1748.049<\/strong>.<\/li>\n\n\n\n<li>Microsoft Exchange Server Subscription Edition (SE) RTM (x64): versiones desde 15.02.0.0 hasta antes de\u00a0<strong>15.02.2562.046<\/strong>.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Descripci\u00f3n<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Recientemente, Microsoft revel\u00f3 la vulnerabilidad CVE-2026-62911, reportada por Orange Tsai, del equipo DEVCORE Research Team, en Microsoft Exchange Server, plataforma local de correo electr\u00f3nico, calendario y colaboraci\u00f3n empresarial. La vulnerabilidad posee una severidad alta, con puntuaci\u00f3n CVSS v3.1 de 8.0 y puede permitir que un atacante autenticado con pocos privilegios eleve sus permisos a trav\u00e9s de la red.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La vulnerabilidad se clasifica como CWE-294: bypass de autenticaci\u00f3n mediante captura y repetici\u00f3n (capture-replay). Un atacante puede reutilizar una solicitud o material de autenticaci\u00f3n previamente capturado para eludir los controles de autenticaci\u00f3n previstos, lo que habilita el acceso con privilegios superiores dentro de Exchange.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">El an\u00e1lisis publicado por Zero Day Initiative indica que el problema reside en el procesamiento de solicitudes de autorizaci\u00f3n y en una gesti\u00f3n inadecuada de sesiones. En un escenario de explotaci\u00f3n, esta condici\u00f3n puede encadenarse con otras vulnerabilidades para alcanzar ejecuci\u00f3n de c\u00f3digo bajo el contexto de SYSTEM, comprometiendo confidencialidad, integridad y disponibilidad del servidor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No hay evidencia p\u00fablica de explotaci\u00f3n activa al momento de la publicaci\u00f3n. Sin embargo, CISA clasifica el impacto t\u00e9cnico potencial como total; por ello, los servidores Exchange expuestos o de alta criticidad deben priorizarse en el ciclo de parcheo.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Soluci\u00f3n:&nbsp;<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Microsoft corrigi\u00f3 la vulnerabilidad mediante las actualizaciones de seguridad publicadas de&nbsp;<strong>agosto de 2026<\/strong>. Se recomienda aplicar de inmediato el Security Update correspondiente y comprobar que el servidor alcance, como m\u00ednimo, las compilaciones corregidas indicadas anteriormente.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Para Exchange Server 2019 CU15, instalar&nbsp;<a href=\"https:\/\/support.microsoft.com\/en-us\/servicing\/exchange\/server\/update\/2026\/5121574\">KB5121574<\/a>. Para Exchange Server 2016 CU23, instalar&nbsp;<a href=\"https:\/\/support.microsoft.com\/en-us\/servicing\/exchange\/server\/update\/2026\/5121576\">KB5121576<\/a>. Las actualizaciones para Exchange SE y Exchange 2019 CU14 est\u00e1n disponibles en el&nbsp;<a href=\"https:\/\/techcommunity.microsoft.com\/blog\/Exchange\/released-august-2026-exchange-server-security-updates\/4543951\">bolet\u00edn de actualizaciones de seguridad de agosto de 2026<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Exchange Server 2016 y 2019 ya se encuentran fuera de soporte general; las actualizaciones de agosto de 2026 requieren pertenecer al programa Extended Security Updates (ESU), per\u00edodo 2. Las organizaciones que no cuenten con ESU deben planificar la migraci\u00f3n a Exchange Server Subscription Edition. Tras actualizar, se recomienda ejecutar el&nbsp;<a href=\"https:\/\/microsoft.github.io\/CSS-Exchange\/Diagnostics\/HealthChecker\/\">Exchange Server Health Checker<\/a>&nbsp;para validar la instalaci\u00f3n y revisar configuraciones adicionales.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Como medidas de reducci\u00f3n de exposici\u00f3n, limite el acceso a Exchange \u00fanicamente a redes y usuarios necesarios, aplique m\u00ednimo privilegio a las cuentas, supervise eventos de autenticaci\u00f3n y autorizaci\u00f3n an\u00f3malos y analice solicitudes repetidas o sesiones inusuales.<\/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:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2026-62911\">https:\/\/msrc.microsoft.com\/update-guide\/vulnerability\/CVE-2026-62911<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.zerodayinitiative.com\/advisories\/ZDI-26-538\/\">https:\/\/www.zerodayinitiative.com\/advisories\/ZDI-26-538\/<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/learn.microsoft.com\/en-us\/exchange\/new-features\/build-numbers-and-release-dates\">https:\/\/learn.microsoft.com\/en-us\/exchange\/new-features\/build-numbers-and-release-dates<\/a><\/li>\n<\/ul>\n","protected":false},"featured_media":5710,"template":"","class_list":["post-11691","publicacion","type-publicacion","status-publish","has-post-thumbnail","hentry"],"acf":{"activar_pdf_link":false,"pdf":null,"numero_de_boletin":"91","traffic_light_protocol":"White"},"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): Microsoft Exchange Server 2016 CU23 (x64): versiones desde 15.01.0.0 hasta antes de 15.01.2507.072. 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