{"id":79712,"date":"2025-10-01T16:30:05","date_gmt":"2025-10-01T16:30:05","guid":{"rendered":""},"modified":"2025-11-02T15:07:59","modified_gmt":"2025-11-02T21:07:59","slug":"cve-2025-59841-session-invalidation-vulnerability-in-flag-forge-ctf-platform","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-59841-session-invalidation-vulnerability-in-flag-forge-ctf-platform\/","title":{"rendered":"<strong>CVE-2025-59841: Session Invalidation Vulnerability in Flag Forge CTF Platform<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The cybersecurity landscape is constantly evolving, and as new threats emerge, it remains crucial for organizations to stay vigilant. In this regard, one recent vulnerability that has caught the attention of cybersecurity professionals is CVE-2025-59841. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-36901-critical-wlan-vulnerability-in-android-affecting-google-pixel-devices\/\"  data-wpil-monitor-id=\"87427\">vulnerability affects<\/a> the Flag Forge Capture The Flag (CTF) platform, which is widely used by cybersecurity teams for training and skill development purposes.<br \/>\nThe <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58745-arbitrary-file-upload-vulnerability-in-wegia-web-manager-for-charitable-institutions\/\"  data-wpil-monitor-id=\"88103\">vulnerability stems from Flag Forge&#8217;s web<\/a> application&#8217;s improper handling of session invalidation in versions 2.2.0 to before 2.3.1. This flaw could potentially lead to <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49401-critical-deserialization-of-untrusted-data-vulnerability-in-expresstech-systems-quiz-and-survey-master\/\"  data-wpil-monitor-id=\"87160\">system compromise or data<\/a> leakage, posing a significant threat to organizations that rely on Flag Forge for their cybersecurity training.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-59841<br \/>\nSeverity: Critical (9.8 CVSS Severity Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-48539-critical-out-of-bounds-read-in-acl-arbiter-cc-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"87352\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-364433180\" 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>Flag Forge | 2.2.0 to 2.3.0<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The vulnerability resides in the improper handling of <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58361-xss-vulnerability-in-promptcraft-forge-studio-via-non-exhaustive-url-scheme-check\/\"  data-wpil-monitor-id=\"87047\">session invalidation by the Flag<\/a> Forge web application. In a typical secure application, logging out should invalidate a user session, making it impossible for any <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-3498-unauthenticated-user-access-and-modification-of-radiflow-isap-smart-collector-configuration\/\"  data-wpil-monitor-id=\"92250\">user to continue accessing<\/a> protected endpoints. However, in the affected versions of Flag Forge, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6454-authenticated-user-exploit-in-gitlab-ce-ee-through-proxy-environments\/\"  data-wpil-monitor-id=\"90744\">authenticated users<\/a> can continue to access protected endpoints such as \/api\/profile even after logging out.<br \/>\nMoreover, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-58833-cross-site-request-forgery-vulnerability-in-invelity-mygls-connect\/\"  data-wpil-monitor-id=\"86982\">Cross-Site Request Forgery<\/a> (CSRF) tokens remain valid post-logout. This allows <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-10034-d-link-dir-825-buffer-overflow-vulnerability-leading-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"87481\">potential attackers to perform unauthorized actions since the system<\/a> still recognizes these tokens as legitimate. This <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-47129-out-of-bounds-write-vulnerability-in-adobe-framemaker-with-potential-for-arbitrary-code-execution\/\"  data-wpil-monitor-id=\"86907\">vulnerability opens a potential<\/a> attack vector for malicious actors who can exploit this flaw to possibly compromise the system or leak sensitive data.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-561603500\" 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>Here&#8217;s a conceptual example of how an attacker might exploit this vulnerability:<\/p>\n<pre><code class=\"\" data-line=\"\">GET \/api\/profile HTTP\/1.1\nHost: target.example.com\nCookie: sessionid=...; csrftoken=...\nGET \/logout HTTP\/1.1\nHost: target.example.com\nCookie: sessionid=...; csrftoken=...\nGET \/api\/profile HTTP\/1.1\nHost: target.example.com\nCookie: sessionid=...; csrftoken=...<\/code><\/pre>\n<p>In this example, the attacker is able to access the \/api\/profile endpoint even after issuing a \/logout request, exploiting the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-54236-critical-improper-input-validation-vulnerability-in-adobe-commerce-leading-to-session-takeover\/\"  data-wpil-monitor-id=\"88822\">session invalidation vulnerability<\/a>. The CSRF token remains valid after logout, allowing the attacker to continue accessing the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-9693-arbitrary-file-deletion-vulnerability-in-user-meta-user-profile-builder-plugin-for-wordpress\/\"  data-wpil-monitor-id=\"90601\">user&#8217;s profile<\/a>.<br \/>\nIt is strongly recommended to apply the vendor patch (version 2.3.1) or use a Web Aplication Firewall (WAF) or Intrusion Detection System (IDS) as temporary mitigation. Always ensure that your <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2024-36326-bypassing-amd-romarmor-protections-to-compromise-system-security\/\"  data-wpil-monitor-id=\"87854\">systems are up-to-date with the latest security patches to protect<\/a> against such vulnerabilities.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The cybersecurity landscape is constantly evolving, and as new threats emerge, it remains crucial for organizations to stay vigilant. In this regard, one recent vulnerability that has caught the attention of cybersecurity professionals is CVE-2025-59841. This vulnerability affects the Flag Forge Capture The Flag (CTF) platform, which is widely used by cybersecurity teams for [&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":[90],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-79712","post","type-post","status-publish","format-standard","hentry","category-uncategorized","attack_vector-csrf"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/79712","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=79712"}],"version-history":[{"count":13,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/79712\/revisions"}],"predecessor-version":[{"id":85466,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/79712\/revisions\/85466"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=79712"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=79712"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=79712"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=79712"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=79712"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=79712"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=79712"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=79712"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=79712"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}