{"id":64068,"date":"2025-08-15T07:23:04","date_gmt":"2025-08-15T07:23:04","guid":{"rendered":""},"modified":"2025-10-03T12:32:59","modified_gmt":"2025-10-03T18:32:59","slug":"cve-2025-53787-microsoft-365-copilot-bizchat-information-disclosure-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-53787-microsoft-365-copilot-bizchat-information-disclosure-vulnerability\/","title":{"rendered":"<strong>CVE-2025-53787: Microsoft 365 Copilot BizChat Information Disclosure Vulnerability<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The Common Vulnerabilities and Exposures system has identified a high severity vulnerability, CVE-2025-53787, in Microsoft 365&#8217;s Copilot BizChat. This vulnerability poses a significant threat to users of this popular business communication tool, enabling potential system compromise or data leakage. Its severity underscores the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8913-critical-local-file-inclusion-vulnerability-in-wellchoose-s-organization-portal-system\/\"  data-wpil-monitor-id=\"82440\">critical need for organizations<\/a> to prioritize cybersecurity in their operations, particularly when relying on widely used software applications like Microsoft 365.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-53787<br \/>\nSeverity: High (8.2 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: None<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-27043-memory-corruption-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"75490\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-3059292207\" class=\"ameeb-content-2 ameeb-entity-placement\"><div style=\"border-left: 4px solid #555; padding-left: 20px; margin: 48px 0; font-family: Roboto, sans-serif; color: #ffffff; line-height: 1.6; max-width: 720px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 22px; font-weight: 600; display: flex; align-items: center; letter-spacing: -0.02em;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 10px;\">\r\n      <img decoding=\"async\" src=\"https:\/\/www.ameeba.com\/blog\/wp-content\/uploads\/2025\/10\/Best-App-icon-Ameeba.png\" alt=\"Ameeba Chat Icon\" style=\"width: 42px; height: 42px;\" \/>\r\n    <\/a>\r\n    Share secrets securely\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 14px; color: #d1d5db;\">\r\n    Ameeba is private infrastructure for communication and sensitive work built on encrypted identity instead of exposed corporate identity systems.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 18px; color: #a1a1aa;\">\r\n    Passwords, credentials, confidential files, screenshots, internal discussions, sensitive AI context, and private coordination should not become exposed across ordinary communication platforms.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 24px; color: #e4e4e7;\">\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Encrypted identity<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Private Spaces for organizations and teams<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 End-to-end encrypted chat, calls, files, and notes<\/li>\r\n    <li style=\"margin-bottom: 8px;\">\u2022 Sensitive AI work and protected collaboration<\/li>\r\n    <li>\u2022 Built for information that cannot leak<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px; color: #ffffff;\">\r\n    Our mission is to secure human work alongside AI.\r\n  <\/p>\r\n\r\n  <div style=\"display: flex; flex-wrap: wrap; gap: 12px;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\/download\" style=\"background-color: #ffffff; color: #000000; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Download Ameeba\r\n    <\/a>\r\n\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 8px; font-weight: 500;\">\r\n      Learn More\r\n    <\/a>\r\n  <\/div>\r\n<\/div><\/div>\n<p>Product | Affected Versions<\/p>\n<p>Microsoft 365 | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55010-arbitrary-php-object-instantiation-in-kanboard-prior-to-version-1-2-47\/\"  data-wpil-monitor-id=\"78088\">versions prior<\/a> to security update<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-43193-critical-memory-handling-vulnerability-in-macos\/\"  data-wpil-monitor-id=\"72859\">vulnerability is a result of improper handling<\/a> of user data within the Copilot BizChat application. An attacker can exploit this <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53145-type-confusion-vulnerability-in-windows-message-queuing-allowing-remote-code-execution\/\"  data-wpil-monitor-id=\"78208\">vulnerability by sending specially crafted messages<\/a> or requests to a targeted user. Once the malicious content is interacted with, it triggers a flaw in the application&#8217;s security protocols, leading to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53499-critical-unauthorized-access-vulnerability-in-wikimedia-foundation-mediawiki-abusefilter-extension\/\"  data-wpil-monitor-id=\"72858\">unauthorized access<\/a> to sensitive information.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3893275362\" class=\"ameeb-content ameeb-entity-placement\"><div class=\"poptin-embedded\" data-id=\"f6b387694f681\"><\/div>\r\n\r\n\r\n\r\n\r\n\r\n<\/div>\n<p>This is a conceptual example of how the vulnerability might be exploited. In this instance, a malicious HTTP <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52797-critical-cross-site-request-forgery-csrf-vulnerability-in-josepsitjar-storymap\/\"  data-wpil-monitor-id=\"79415\">request is sent to the vulnerable<\/a> endpoint:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/bizchat\/v1\/message HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;message_content&quot;: &quot;&lt;script&gt;malicious_code_here&lt;\/script&gt;&quot; }<\/code><\/pre>\n<p>Upon interaction with the malicious message, the attacker&#8217;s code is executed, potentially leading to unauthorized <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-42976-memory-corruption-and-information-disclosure-in-sap-netweaver-application-server-abap\/\"  data-wpil-monitor-id=\"74377\">information disclosure<\/a>, system compromise, or other unforeseen consequences.<\/p>\n<p><strong>Mitigation and Prevention<\/strong><\/p>\n<p>It is highly recommended that users of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-53786-microsoft-exchange-server-security-vulnerability-in-hybrid-deployments\/\"  data-wpil-monitor-id=\"81282\">Microsoft 365&#8217;s Copilot BizChat apply the vendor&#8217;s security<\/a> patch as soon as possible. This patch addresses the identified <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52914-sql-injection-vulnerability-in-mitel-micollab-suite-applications-services\/\"  data-wpil-monitor-id=\"75692\">vulnerability and restores the application&#8217;s<\/a> security integrity. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation method. These tools can help <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-20217-denial-of-service-vulnerability-in-snort-3-detection-engine-of-cisco-secure-firewall-threat-defense-software\/\"  data-wpil-monitor-id=\"77144\">detect and block malicious traffic aimed at exploiting this vulnerability<\/a>.<br \/>\nHowever, while these temporary measures can provide some level of protection, they are not a substitute for applying the security patch, which provides the most comprehensive <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-52376-authentication-bypass-vulnerability-in-nexxt-solutions-ncm-x1800-mesh-router\/\"  data-wpil-monitor-id=\"75489\">solution to this vulnerability<\/a>. Regular software updates and patches remain a crucial part of an effective <a href=\"https:\/\/www.ameeba.com\/blog\/introducing-the-ameeba-cybersecurity-group-chat\/\"  data-wpil-monitor-id=\"88490\">cybersecurity<\/a> strategy.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The Common Vulnerabilities and Exposures system has identified a high severity vulnerability, CVE-2025-53787, in Microsoft 365&#8217;s Copilot BizChat. This vulnerability poses a significant threat to users of this popular business communication tool, enabling potential system compromise or data leakage. Its severity underscores the critical need for organizations to prioritize cybersecurity in their operations, particularly [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[1],"tags":[],"vendor":[82],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64068","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-microsoft"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64068","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/comments?post=64068"}],"version-history":[{"count":11,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64068\/revisions"}],"predecessor-version":[{"id":81297,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/64068\/revisions\/81297"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=64068"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=64068"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=64068"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=64068"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=64068"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=64068"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=64068"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=64068"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=64068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}