CVE-2026-7377: XSS in GitLab Customizable Analytics Dashboards

Successful exploitation of CVE-2026-7377 could lead to significant consequences for GitLab users. An attacker could leverage this XSS vulnerability to steal session cookies, enabling them to impersonate other users and gain unauthorized access to sensitive data and functionalities. This could include accessing project repositories, modifying configurations, or even escalating privileges within the GitLab instance. The impact is particularly severe as it affects customizable analytics dashboards, which are often used by administrators and project managers to monitor key metrics, potentially exposing critical information to malicious actors. The ability to execute arbitrary JavaScript provides a broad attack surface, allowing for diverse malicious actions beyond simple cookie theft.

1. Réservé2026-04-29
2. Publiée2026-05-14

The primary mitigation for CVE-2026-7377 is to upgrade GitLab EE to version 18.11.3 or later. If immediate upgrading is not feasible, consider restricting access to customizable analytics dashboards to trusted users only. Implement strict input validation and output encoding on all user-supplied data within these dashboards to prevent malicious code injection. Web Application Firewalls (WAFs) configured to detect and block XSS payloads can provide an additional layer of defense. Review GitLab’s security best practices for dashboard customization to minimize the attack surface. After upgrading, verify the fix by attempting to inject a simple JavaScript payload into a customizable analytics dashboard and confirming it is properly sanitized and does not execute.