<style id="elementor-post-14015">.elementor-14015 .elementor-element.elementor-element-163e62e{--display:flex;}.elementor-14015 .elementor-element.elementor-element-d273d7d > .elementor-widget-container{background-color:#FFFFFF80;margin:0px 0px 20px 0px;}.elementor-14015 .elementor-element.elementor-element-d273d7d{--box-border-color:#00000029;--item-text-hover-decoration:underline;}.elementor-14015 .elementor-element.elementor-element-d273d7d .elementor-toc__header-title{text-align:start;}.elementor-14015 .elementor-element.elementor-element-d273d7d .elementor-toc__header{flex-direction:row;}.elementor-14015 .elementor-element.elementor-element-2e7159b{--display:flex;--min-height:300px;--flex-direction:column;--container-widget-width:100%;--container-widget-height:initial;--container-widget-flex-grow:0;--container-widget-align-self:initial;--flex-wrap-mobile:wrap;}.elementor-14015 .elementor-element.elementor-element-2e7159b:not(.elementor-motion-effects-element-type-background), .elementor-14015 .elementor-element.elementor-element-2e7159b > .elementor-motion-effects-container > .elementor-motion-effects-layer{background-position:center center;background-repeat:no-repeat;background-size:cover;}.elementor-14015 .elementor-element.elementor-element-c87629f{--display:flex;}@media(max-width:1024px){.elementor-14015 .elementor-element.elementor-element-2e7159b{--min-height:200px;}}@media(max-width:767px){.elementor-14015 .elementor-element.elementor-element-2e7159b{--min-height:100px;}}/* Start custom CSS for table-of-contents, class: .elementor-element-d273d7d */.elementor-14015 .elementor-element.elementor-element-d273d7d ul {
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}/* End custom CSS */</style><style id="elementor-post-dynamic-14015">.elementor-14015 .elementor-element.elementor-element-2e7159b:not(.elementor-motion-effects-element-type-background), .elementor-14015 .elementor-element.elementor-element-2e7159b > .elementor-motion-effects-container > .elementor-motion-effects-layer{background-image:url("https://www.infordisa.com/soc/wp-content/uploads/2026/09/security_defaults.jpg");}</style>{"id":14015,"date":"2026-09-22T17:39:34","date_gmt":"2026-09-22T15:39:34","guid":{"rendered":"https:\/\/www.infordisa.com\/soc\/?p=14015"},"modified":"2026-09-22T17:49:14","modified_gmt":"2026-09-22T15:49:14","slug":"security-defaults-microsoft-365","status":"publish","type":"post","link":"https:\/\/www.infordisa.com\/soc\/ca\/security-defaults-microsoft-365\/","title":{"rendered":"Activa els valors per defecte de seguretat a Microsoft 365"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"14015\" class=\"elementor elementor-14015\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-163e62e e-flex e-con-boxed e-con e-parent\" data-id=\"163e62e\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d273d7d elementor-toc--content-ellipsis elementor-toc--minimized-on-mobile elementor-widget elementor-widget-table-of-contents\" data-id=\"d273d7d\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings='{\"headings_by_tags\":[\"h2\"],\"exclude_headings_by_selector\":[],\"marker_view\":\"bullets\",\"icon\":{\"value\":\"fas fa-chevron-right\",\"library\":\"fa-solid\"},\"no_headings_message\":\"No se ha encontrado ning\\u00fan encabezado en esta p\\u00e1gina.\",\"minimized_on\":\"mobile\",\"minimize_box\":\"yes\",\"hierarchical_view\":\"yes\",\"min_height\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"min_height_tablet\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]},\"min_height_mobile\":{\"unit\":\"px\",\"size\":\"\",\"sizes\":[]}}' data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h4 class=\"elementor-toc__header-title\">\n\t\t\t\tTabla de contenidos\t\t\t<\/h4>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__d273d7d\" aria-expanded=\"true\" aria-label=\"Abrir la tabla de contenidos\"><i aria-hidden=\"true\" class=\"fas fa-chevron-down\"><\/i><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__d273d7d\" aria-expanded=\"true\" aria-label=\"Cerrar la tabla de contenidos\"><i aria-hidden=\"true\" class=\"fas fa-chevron-up\"><\/i><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__d273d7d\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<i class=\"elementor-toc__spinner eicon-animation-spin eicon-loading\" aria-hidden=\"true\"><\/i>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1c52ed5 elementor-widget elementor-widget-text-editor\" data-id=\"1c52ed5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2>Security Defaults en Microsoft 365: la protecci&oacute;n que ya tienes pagada y probablemente no tienes activada<\/h2><p>Muchos entornos de Microsoft 365 funcionan a&uacute;n s&oacute;lo con contrase&ntilde;a. Microsoft incluye de serie un conjunto de protecciones b&aacute;sicas, las Security Defaults, que cierran los vectores de ataque m&aacute;s explotados. Ni cuestan dinero ni requieren licencias adicionales, y Microsoft calcula que basta con exigir <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/mfa\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>MFA<\/a> para bloquear m&aacute;s del 99% de los ataques de apropiaci&oacute;n de cuentas.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2e7159b e-con-full e-flex e-con e-child\" data-id=\"2e7159b\" data-element_type=\"container\" data-e-type=\"container\" data-settings='{\"background_background\":\"classic\"}'>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-142d255 elementor-widget elementor-widget-text-editor\" data-id=\"142d255\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 dir=\"ltr\">El problema: la contrase&ntilde;a sola ya no protege<\/h2><p dir=\"ltr\">El <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/phishing\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>phishing<\/a> y las filtraciones de credenciales son hoy la puerta de entrada m&aacute;s habitual a los entornos corporativos. La complejidad de la contrase&ntilde;a es irrelevante cuando el usuario la ha escrito en una p&aacute;gina falsa o cuando aparece en una brecha de un servicio de terceros en el que se hab&iacute;a reutilizado.<\/p><h2 dir=\"ltr\">&iquest;Qu&eacute; ocurre cuando comprometen un buz&oacute;n de M365?<\/h2><p dir=\"ltr\">El acceso al correo raramente es el final del ataque, es el principio. El patr&oacute;n que vemos repetidamente:<\/p><ul dir=\"ltr\"><li>Lectura e interceptaci&oacute;n silenciosa de comunicaciones durante semanas.<\/li><li>Creaci&oacute;n de reglas ocultas que reenv&iacute;an o borran mensajes para que la v&iacute;ctima no vea las respuestas.<\/li><li>Acceso y descarga de informaci&oacute;n corporativa a SharePoint, OneDrive y Teams.<\/li><li>Env&iacute;o de correos desde la cuenta leg&iacute;tima: fraude del CEO, suplantaci&oacute;n frente a clientes y proveedores.<\/li><li>Modificaci&oacute;n de datos bancarios en facturas y &oacute;rdenes de pago (fraude del cambio de IBAN).<\/li><li>Uso del buz&oacute;n como plataforma de phishing hacia el resto de contactos.<\/li><li>Salto a otros servicios en los que se hayan reutilizado las mismas credenciales.<\/li><\/ul><h2 dir=\"ltr\">&iquest;Qu&eacute; hacen exactamente las Security Defaults?<\/h2><p dir=\"ltr\">A menudo se resumen como &laquo;activar el MFA&raquo;, y es una simplificaci&oacute;n. Aplican una l&iacute;nea base a todo el tenante:<\/p><ul dir=\"ltr\"><li>Obligan a todos los usuarios a registrar un m&eacute;todo de <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/autenticacion\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">autenticaci&oacute;n<\/a> multifactor.<\/li><li>Piden verificaci&oacute;n adicional cuando Microsoft detecta se&ntilde;ales de riesgo.<\/li><li>Exigen MFA en las cuentas administradoras y en las operaciones privilegiadas.<\/li><li>Bloquean los protocolos de autenticaci&oacute;n antiguos (legacy authentication), que no admiten <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/mfa\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>MFA<\/a> y son la v&iacute;a habitual para sortearla.<\/li><li>Bloquean mecanismos de autenticaci&oacute;n explotables en ataques de phishing.<\/li><li>Refuerzan el acceso a los portales de administraci&oacute;n y a la configuraci&oacute;n del tenante.<\/li><\/ul><p dir=\"ltr\">Es una protecci&oacute;n gratuita, disponible en cualquier plan de Microsoft 365 &mdash;incluidos Business Basic y Business Standard&mdash;, sin necesidad de licencias de Entra ID P1\/P2.<\/p><h2 dir=\"ltr\">Antes de activarlas: el inventario<\/h2><p dir=\"ltr\">El error t&iacute;pico es activarlas un viernes por la tarde y encontrarse el lunes con el esc&aacute;ner que ya no env&iacute;a correos. Hay que identificar previamente todo lo que autentica sin MFA:<\/p><ul dir=\"ltr\"><li>Impresoras y esc&aacute;neres multifunci&oacute;n que env&iacute;an correo por <a class=\"glossaryLink\"  href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/smtp\/\"  data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex='0' role='link'>SMTP<\/a>.<\/li><li>Aplicaciones de gesti&oacute;n, ERP o verticales que env&iacute;an notificaciones con una cuenta de M365.<\/li><li>Dispositivos y software antiguo con protocolos heredados (POP3, IMAP, SMTP AUTH b&aacute;sico).<\/li><li>Cuentas de servicio y buzones compartidos utilizados por automatismos.<\/li><\/ul><p dir=\"ltr\">Para cada caso existe alternativa: migrar a <a class=\"glossaryLink\" href=\"https:\/\/www.infordisa.com\/soc\/ca\/glosario-definicion\/autenticacion\/\" data-gt-translate-attributes='[{\"attribute\":\"data-cmtooltip\", \"format\":\"html\"}]' tabindex=\"0\" role=\"link\">autenticaci&oacute;n<\/a> moderna, utilizar un relay SMTP autenticado o replantear la cuenta de servicio. Lo importante es decidirlo antes, no descubrirlo despu&eacute;s.<\/p><h2 dir=\"ltr\">El despliegue que os recomendamos<\/h2><ol dir=\"ltr\"><li>Inventario de dispositivos, aplicaciones y cuentas de servicio con autenticaci&oacute;n incompatible.<\/li><li>Plan de adaptaci&oacute;n para cada elemento detectado.<\/li><li>Fecha de activaci&oacute;n acordada, evitando cierres de mes y picos de trabajo.<\/li><li>Comunicaci&oacute;n previa a los usuarios con instrucciones para registrar Microsoft Authenticator u otro m&eacute;todo admitido.<\/li><li>Activaci&oacute;n desde el Centro de administraci&oacute;n de Microsoft Entra (<em>Identidad &gt; Propiedades &gt; Administrar los Valores predeterminados de seguridad<\/em>) y acompa&ntilde;amiento en los primeros d&iacute;as, cuando se concentran las incidencias de registro.<\/li><\/ol><h2 dir=\"ltr\">Toma nota de esta buena pr&aacute;ctica<\/h2><p dir=\"ltr\">Las Security Defaults son lo m&iacute;nimo, no el techo. Si su entorno tiene licencia Entra ID P1 o superior, el siguiente paso son las pol&iacute;ticas de acceso condicional, que permiten afinar por ubicaci&oacute;n, dispositivo, aplicaci&oacute;n y riesgo. Pero ninguna organizaci&oacute;n deber&iacute;a quedarse por debajo de la l&iacute;nea base: <strong>activarlas hoy elimina la mayor&iacute;a de los ataques oportunistas de credenciales<\/strong>.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8d2bd37 elementor-alert-success elementor-widget elementor-widget-alert\" data-id=\"8d2bd37\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"alert.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-alert\" role=\"alert\">\n\n\t\t\t\t\t\t<span class=\"elementor-alert-title\">Security Defaults<\/span>\n\t\t\t\n\t\t\t\t\t\t<span class=\"elementor-alert-description\">En Infordisa revisamos el estado de las Security Defaults de su Tenant, hacemos el inventario de dispositivos afectados y planificamos la activaci&oacute;n con usted.<\/span>\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c87629f e-flex e-con-boxed e-con e-parent\" data-id=\"c87629f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Les Security Defaults de Microsoft 365 bloquegen el 99% dels atacs i s\u00f3n gratu\u00eftes. Descobreix qu\u00e8 fan i com activar-les.<\/p>","protected":false},"author":2,"featured_media":14018,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[54,224,62],"class_list":["post-14015","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-buenas-practicas","tag-contrasenas","tag-mfa","tag-microsoft","masonry-post","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-25"],"acf":[],"yoast_head":"<title>Activa los valores predeterminados de seguridad en Microsoft 365 - Infordisa \/ Security Operations Center<\/title>\n<meta name=\"description\" content=\"Las Security Defaults de Microsoft 365 bloquean el 99% de los ataques y son gratuitas. 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