{"id":44238,"date":"2025-05-25T06:34:03","date_gmt":"2025-05-25T06:34:03","guid":{"rendered":""},"modified":"2025-07-08T23:21:39","modified_gmt":"2025-07-09T05:21:39","slug":"cve-2025-26646-a-high-risk-spoofing-vulnerability-in-net-visual-studio-and-build-tools-for-visual-studio","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-26646-a-high-risk-spoofing-vulnerability-in-net-visual-studio-and-build-tools-for-visual-studio\/","title":{"rendered":"<strong>CVE-2025-26646: A High-Risk Spoofing Vulnerability in .NET, Visual Studio, and Build Tools for Visual Studio<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape has witnessed a significant development with the discovery of the CVE-2025-26646 vulnerability. This vulnerability, affecting .NET, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-55319-command-injection-vulnerability-in-agentic-ai-and-visual-studio-code\/\"  data-wpil-monitor-id=\"90048\">Visual Studio<\/a>, and Build Tools for Visual Studio, allows an authorized attacker to gain external control of file name or path, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-4648-integrity-check-vulnerability-in-centreon-web-leading-to-potential-xss-injection\/\"  data-wpil-monitor-id=\"49878\">leading to potential<\/a> spoofing over a network. Users and organizations using these technologies are at a high risk of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31049-untrusted-data-deserialization-vulnerability-in-themeton-dash-exposes-systems-to-object-injection\/\"  data-wpil-monitor-id=\"53858\">system compromise and data<\/a> leakage, making it an urgent issue that requires immediate attention. The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-52928-severe-bypass-issue-in-arc-on-windows-allows-unauthorized-permissions-grant\/\"  data-wpil-monitor-id=\"65106\">severity of the issue<\/a> is further emphasized by its CVSS severity score of 8.0, indicating a high level of threat.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-26646<br \/>\nSeverity: High (CVSS: 8.0)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-52880-critical-vulnerability-in-insyde-insydeh2o-kernels-potentially-leading-to-system-compromise\/\"  data-wpil-monitor-id=\"51473\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-1304558837\" 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: 700px;\">\r\n  <h2 style=\"margin-top: 0; font-size: 20px; font-weight: 600; display: flex; align-items: center;\">\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"display: inline-flex; align-items: center; margin-right: 8px;\">\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: 40px; height: 40px;\" \/>\r\n    <\/a>\r\n    A new way to communicate\r\n  <\/h2>\r\n\r\n  <p style=\"margin-bottom: 12px;\">\r\n    Ameeba Chat is built on encrypted identity, not personal profiles.\r\n  <\/p>\r\n\r\n  <p style=\"margin-bottom: 16px;\">\r\n    Message, call, share files, and coordinate with identities kept separate.\r\n  <\/p>\r\n\r\n  <ul style=\"list-style: none; padding-left: 0; margin-bottom: 20px;\">\r\n    <li>\u2022 Encrypted identity<\/li>\r\n    <li>\u2022 Ameeba Chat authenticates access<\/li>\r\n    <li>\u2022 Aliases and categories<\/li>\r\n    <li>\u2022 End-to-end encrypted chat, calls, and files<\/li>\r\n    <li>\u2022 Secure notes for sensitive information<\/li>\r\n  <\/ul>\r\n\r\n  <p style=\"font-style: italic; font-weight: 600; margin-bottom: 24px;\">\r\n    Private communication, rethought.\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: 6px; font-weight: 500;\">Download Ameeba Chat<\/a>\r\n    <a href=\"https:\/\/www.ameeba.com\/chat\" style=\"border: 1px solid #ffffff; color: #ffffff; padding: 10px 20px; text-decoration: none; border-radius: 6px; font-weight: 500;\">Learn More<\/a>\r\n  <\/div>\r\n<\/div>\r\n<\/div>\n<p>Product | Affected Versions<\/p>\n<p>.NET | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48865-manipulation-of-x-forwarded-headers-in-fabio-prior-to-version-1-6-6\/\"  data-wpil-monitor-id=\"58315\">versions prior<\/a> to the security patch<br \/>\nVisual Studio | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-44148-critical-xss-vulnerability-in-mailenable-prior-to-version-10\/\"  data-wpil-monitor-id=\"58676\">versions prior<\/a> to the security patch<br \/>\nBuild Tools for Visual Studio | All <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49137-critical-vulnerability-in-hax-cms-php-prior-to-version-11-0-0\/\"  data-wpil-monitor-id=\"65107\">versions prior<\/a> to the security patch<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-48766-critical-unauthenticated-file-reading-vulnerability-in-netalertx\/\"  data-wpil-monitor-id=\"50109\">vulnerability CVE-2025-26646 stems from an insufficient control of file<\/a> name or path within .NET, Visual Studio, and Build Tools for Visual Studio. An authorized attacker can <a href=\"https:\/\/www.ameeba.com\/blog\/global-honeypot-creation-exploits-cisco-flaw-unmasking-the-vicioustrap-attack\/\"  data-wpil-monitor-id=\"50984\">exploit this flaw<\/a> by sending a specifically crafted request that alters the file name or path. This can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47884-jenkins-openid-connect-provider-plugin-vulnerability-leading-to-unauthorized-access\/\"  data-wpil-monitor-id=\"49997\">lead to the attacker gaining unauthorized<\/a> access to restricted files or injecting malicious scripts, potentially resulting in spoofing over a network, system compromise, or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-4059219882\" 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>An attacker might exploit the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47708-cross-site-request-forgery-vulnerability-in-drupal-enterprise-mfa-tfa\/\"  data-wpil-monitor-id=\"49812\">vulnerability using a HTTP request<\/a> as shown below:<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/target_path\/ HTTP\/1.1\nHost: target.example.com\nContent-Type: application\/json\n{ &quot;file_path&quot;: &quot;..\/..\/..\/etc\/passwd&quot; }<\/code><\/pre>\n<p>In the above example, an attacker is exploiting <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-2305-path-traversal-vulnerability-in-file-download-functionality\/\"  data-wpil-monitor-id=\"50680\">path traversal to access a sensitive file<\/a>, potentially leading to unauthorized access and data leakage.<\/p>\n<p><strong>Mitigation and Conclusion<\/strong><\/p>\n<p>Users are advised to apply the vendor patch as soon as possible to mitigate the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-31637-high-risk-sql-injection-vulnerability-in-lambertgroup-shout\/\"  data-wpil-monitor-id=\"51850\">risks associated with this vulnerability<\/a>. Temporary measures can include the use of a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) to detect and prevent exploit attempts. However, these should not be considered as permanent solutions.<br \/>\nCVE-2025-26646 is a stern reminder of the importance of proactive <a href=\"https:\/\/www.ameeba.com\/blog\/hungarian-government-s-cybersecurity-measures-unpacking-the-implications-and-potential-solutions\/\"  data-wpil-monitor-id=\"53859\">cybersecurity measures<\/a>. By understanding the nature of such <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47933-arbitrary-actions-and-cross-site-scripting-vulnerability-in-argo-cd\/\"  data-wpil-monitor-id=\"58458\">vulnerabilities and taking prompt action<\/a> to address them, users and organizations can significantly mitigate the risks posed by such threats.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape has witnessed a significant development with the discovery of the CVE-2025-26646 vulnerability. This vulnerability, affecting .NET, Visual Studio, and Build Tools for Visual Studio, allows an authorized attacker to gain external control of file name or path, leading to potential spoofing over a network. Users and organizations using these technologies are [&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":[],"product":[],"attack_vector":[85],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-44238","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-directory-traversal"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44238","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=44238"}],"version-history":[{"count":14,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44238\/revisions"}],"predecessor-version":[{"id":82929,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/44238\/revisions\/82929"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=44238"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=44238"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=44238"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=44238"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=44238"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=44238"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=44238"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=44238"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=44238"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}