{"id":64255,"date":"2025-08-23T04:27:38","date_gmt":"2025-08-23T04:27:38","guid":{"rendered":""},"modified":"2025-10-02T00:14:30","modified_gmt":"2025-10-02T06:14:30","slug":"cve-2025-7739-stored-cross-site-scripting-vulnerability-in-gitlab-ce-ee","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-7739-stored-cross-site-scripting-vulnerability-in-gitlab-ce-ee\/","title":{"rendered":"CVE-2025-7739: Stored Cross-Site Scripting Vulnerability in GitLab CE\/EE<\/strong>"},"content":{"rendered":"

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

Recently, a potentially devastating vulnerability, identified as CVE-2025-7739, was discovered in GitLab CE\/EE. This vulnerability affects all versions from 18.2 before 18.2.2. The issue pertains to stored cross-site scripting (XSS), a serious security flaw that can allow authenticated users to inject malicious HTML<\/a> content into scoped label descriptions under certain conditions. This can lead to potential<\/a> system compromise or data leakage, posing significant risks to both data integrity and user privacy.<\/p>\n

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

CVE ID: CVE-2025-7739
\nSeverity: High (8.7 CVSS Score)
\nAttack Vector: Web-based
\nPrivileges Required: User
\nUser Interaction: Required
\nImpact: Potential system compromise<\/a> or data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

GitLab CE | 18.2 before 18.2.2
\nGitLab EE | 18.2 before 18.2.2<\/p>\n

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

The exploit takes advantage of a flaw in the handling of scoped label descriptions in GitLab CE\/EE<\/a>. An attacker with user-level privileges, under certain conditions, can inject malicious<\/a> HTML content into these descriptions. When these descriptions are rendered by a web browser, the malicious code is executed<\/a>, potentially compromising the system or leaking sensitive data.<\/p>\n

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

Here’s a high-level example of how an attacker might exploit this vulnerability:<\/p>\n

POST \/api\/v4\/projects\/1\/labels HTTP\/1.1\nHost: gitlab.example.com\nContent-Type: application\/json\nAuthorization: Bearer \n{\n\"name\": \"legitimate_label\",\n\"color\": \"#0033CC\",\n\"description\": \"\"\n}<\/code><\/pre>\n
In this example, the attacker is creating a new label. The description contains an image tag with a non-existent source (x), triggering the ‘onerror’ event, which executes a JavaScript ‘alert’ function. In a real-world scenario, the malicious script could carry out more harmful actions, such as stealing session cookies or performing actions on behalf of the user.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
The most straightforward way to address this vulnerability<\/a> is by applying the vendor-supplied patch. This patch corrects the flaw within the label description handling, preventing the execution of injected HTML<\/a>. For those who cannot immediately apply the patch, using a web application firewall (WAF) or intrusion detection system (IDS) can offer temporary mitigation by detecting and blocking attempts to exploit this vulnerability<\/a>.
\nNevertheless, it’s important to apply the patch as soon as possible to fully resolve the issue, as relying on WAFs or IDS systems may not provide complete protection against all potential<\/a> exploitation techniques.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview Recently, a potentially devastating vulnerability, identified as CVE-2025-7739, was discovered in GitLab CE\/EE. This vulnerability affects all versions from 18.2 before 18.2.2. The issue pertains to stored cross-site scripting (XSS), a serious security flaw that can allow authenticated users to inject malicious HTML content into scoped label descriptions under certain conditions. This can lead […]<\/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-64255","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