{"id":10344,"date":"2026-01-27T14:48:54","date_gmt":"2026-01-27T12:48:54","guid":{"rendered":"https:\/\/the-s-unit.nl\/?p=10344"},"modified":"2026-01-28T13:11:14","modified_gmt":"2026-01-28T11:11:14","slug":"nieuw-aanvalsoppervlak-ai-assistenten-laten-ongemerkt-data-lekken","status":"publish","type":"post","link":"https:\/\/the-s-unit.nl\/en\/nieuw-aanvalsoppervlak-ai-assistenten-laten-ongemerkt-data-lekken\/","title":{"rendered":"New attack surface: AI assistants silently leak data"},"content":{"rendered":"<div data-elementor-type=\"wp-post\" data-elementor-id=\"10344\" class=\"elementor elementor-10344\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-5965255 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"5965255\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-3b0d935\" data-id=\"3b0d935\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c4704a9 elementor-widget elementor-widget-heading\" data-id=\"c4704a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\"><a href=\"https:\/\/the-s-unit.nl\/en\/consultancy\/trends-nieuws-inzicht\/\">Threats &amp; Insights<\/a><\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1efc667 elementor-widget elementor-widget-heading\" data-id=\"1efc667\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">New attack surface: AI assistants silently leak data<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b3ab7c3 elementor-widget elementor-widget-image\" data-id=\"b3ab7c3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"760\" height=\"458\" src=\"https:\/\/the-s-unit.nl\/wp-content\/uploads\/2026\/01\/1698851956_microsoft-copilot_story.jpg\" class=\"attachment-large size-large wp-image-10355\" alt=\"Nieuw aanvalsoppervlak: AI-assistenten\" srcset=\"https:\/\/the-s-unit.nl\/wp-content\/uploads\/2026\/01\/1698851956_microsoft-copilot_story.jpg 760w, https:\/\/the-s-unit.nl\/wp-content\/uploads\/2026\/01\/1698851956_microsoft-copilot_story-300x181.jpg 300w, https:\/\/the-s-unit.nl\/wp-content\/uploads\/2026\/01\/1698851956_microsoft-copilot_story-18x12.jpg 18w, https:\/\/the-s-unit.nl\/wp-content\/uploads\/2026\/01\/1698851956_microsoft-copilot_story-600x362.jpg 600w\" sizes=\"(max-width: 760px) 100vw, 760px\" \/>\t\t\t\t\t\t\t\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-1119e86 elementor-widget elementor-widget-heading\" data-id=\"1119e86\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">One click is enough<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7cbedaf elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"7cbedaf\" 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<p class=\"translation-block\">Researchers have discovered a new attack technique: the <strong>Reprompt attack<\/strong>. This attack exploits the way AI assistants such as Microsoft Copilot handle user input via URLs. By using a specially crafted link containing hidden instructions, an attacker can make Copilot execute commands. According to security researcher Dolev Taler of Varonis, only a single user click is required. No further interaction is needed and the user remains completely unaware.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-bdbac21 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"bdbac21\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8fc30ef\" data-id=\"8fc30ef\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-405b401 elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"405b401\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Abuse of URL input<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-35f3efb elementor-widget elementor-widget-spacer\" data-id=\"35f3efb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/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-5e418df elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"5e418df\" 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<p>How does this vulnerability arise?\nCopilot does not sufficiently distinguish certain input from URL parameters from legitimate user commands. As a result, an attacker can invisibly make the AI assistant execute new tasks. Even after the user has closed the Copilot interface, the attack can remain active. The hidden instructions are designed to collect and exfiltrate sensitive information from the ongoing session, such as contextual data and other available information. This is something you obviously want to prevent at all times.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-f206463 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"f206463\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8b71385\" data-id=\"8b71385\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-c569f1d elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"c569f1d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Barely visible to users and security tools<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1603f02 elementor-widget elementor-widget-spacer\" data-id=\"1603f02\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/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-852bb26 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"852bb26\" 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<p>The impact is significant, as the attack is barely visible to users and security systems. Traditional security measures, such as content filters and user confirmations, are effectively bypassed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-353cd74 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"353cd74\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-ceb6835\" data-id=\"ceb6835\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a0caed3 elementor-widget elementor-widget-heading\" data-id=\"a0caed3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Patch available, risk remains relevant<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c675405 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"c675405\" 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<p>Microsoft was informed by the researchers and has since addressed the issue. Enterprise Microsoft 365 Copilot environments were not affected. Nevertheless, this attack demonstrates that AI assistants represent a new and complex attack surface, posing serious risks to privacy, compliance, and information security.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-4f6c20c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"4f6c20c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-d067269\" data-id=\"d067269\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f252696 elementor-widget elementor-widget-heading\" data-id=\"f252696\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">How can you reduce or completely prevent this risk?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6c6923 elementor-widget__width-initial elementor-widget elementor-widget-text-editor\" data-id=\"c6c6923\" 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<ul><li>Restrict AI assistants such as Copilot to strictly necessary data (least privilege).<\/li><li>Train users not to click on unknown or unexpected links.<\/li><li>Implement logging and monitoring of AI interactions, including unexpected follow-up actions and outbound communication.<\/li><li>Ensure users understand how prompt injection and indirect AI attacks work.<\/li><li>Explicitly include AI assistants in risk assessments, penetration tests, and security policies.<\/li><\/ul><div>\u00a0<\/div><h5 class=\"translation-block\"><strong data-start=\"203\" data-end=\"263\">Always one step ahead of cyber threats in your industry?<\/strong><br data-start=\"263\" data-end=\"266\">Talk to one of our <strong><a href=\"https:\/\/the-s-unit.nl\/en\/contact\/\" target=\"_self\">security advisors<\/a><\/strong> or explore our <strong><a href=\"https:\/\/the-s-unit.nl\/en\/consultancy\/\" target=\"_self\">consultancyservices<\/a><\/strong>.<\/h5>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-50d4d15 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"50d4d15\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-8dc170a\" data-id=\"8dc170a\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-28a8e99 elementor-widget elementor-widget-spacer\" data-id=\"28a8e99\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"spacer.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-spacer\">\n\t\t\t<div class=\"elementor-spacer-inner\"><\/div>\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"<p>Mendix is a leading low-code platform that enables organizations to rapidly develop, integrate, and scale applications efficiently.<\/p>","protected":false},"author":17,"featured_media":10372,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"footnotes":""},"categories":[74],"tags":[],"class_list":["post-10344","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-threats-insights"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"AI-assistenten zoals Microsoft Copilot vormen een nieuw aanvalsoppervlak. 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