CVE-2025-12669: XSS in GitLab Email Notifications

Successful exploitation of CVE-2025-12669 could allow an attacker to execute arbitrary JavaScript code within the context of a victim's GitLab account. This could lead to account takeover, data theft (including credentials, sensitive project data, and internal communications), and potentially even lateral movement within the GitLab environment. The injected script could be used to steal session cookies, redirect users to phishing sites, or deface GitLab pages. While the vulnerability requires authentication, a compromised account could provide a significant foothold for attackers, especially in organizations with privileged user accounts.

1. 已保留2025-11-03
2. 发布日期2026-05-14

The primary mitigation for CVE-2025-12669 is to upgrade GitLab to version 18.11.3 or later. If immediate upgrading is not possible, consider implementing stricter input validation on user-generated content within GitLab, particularly any data that is included in email notifications. While a direct workaround is not available, reviewing and potentially restricting the permissions of accounts suspected of malicious activity can help limit the potential impact. After upgrading, confirm the fix by sending a test email notification containing a simple HTML tag (e.g., <script>alert('test')</script>) and verifying that the script does not execute when the email is viewed by another user.