CVE-2026-18244: GitLab EE Authorization Bypass Vulnerability

CVE-2026-18244 Overview

CVE-2026-18244 is an improper authorization vulnerability [CWE-862] in GitLab Enterprise Edition (EE). The flaw affects a group settings page where authorization checks are not properly enforced. An authenticated user could view restricted configuration settings that should require higher privileges. GitLab has released patches addressing the issue across supported release branches.

The vulnerability affects GitLab EE versions from 17.7 before 19.0.6, 19.1 before 19.1.4, and 19.2 before 19.2.2. Exploitation requires a valid authenticated session but no user interaction, and the attack can be executed over the network.

Critical Impact
Authenticated users can read restricted group configuration data through a group settings page that lacks proper authorization enforcement.

Affected Products

GitLab EE 17.7 through versions before 19.0.6
GitLab EE 19.1 before 19.1.4
GitLab EE 19.2 before 19.2.2

Discovery Timeline

2026-08-12 - CVE-2026-18244 published to NVD
2026-08-12 - Last updated in NVD database

Technical Details for CVE-2026-18244

Vulnerability Analysis

The vulnerability stems from missing authorization checks [CWE-862] on a GitLab EE group settings page. Under specific conditions, the server returns restricted configuration values to any authenticated user, regardless of the user's role within the group. The response bypasses the role-based access controls GitLab normally enforces for group-level configuration data.

The issue is limited to confidentiality. The advisory does not describe any ability to modify configuration or affect availability. Exposed data may include internal configuration settings that assist an attacker in mapping the environment or planning follow-on activity against the affected group.

Root Cause

GitLab EE relies on server-side authorization checks to gate access to group configuration. On the affected page, the authorization check is either missing or evaluated against an incorrect scope. As a result, low-privileged authenticated users can retrieve settings intended only for group owners or administrators.

Attack Vector

An attacker must hold a valid GitLab account on the target instance. They then send a request to the vulnerable group settings endpoint to retrieve the restricted configuration. No user interaction, elevated privileges, or specialized tooling are required. Refer to the GitLab Patch Release Notes and the GitLab Work Item Details for further context.

Detection Methods for CVE-2026-18244

Indicators of Compromise

Requests to group settings endpoints from user accounts whose roles do not include group administration privileges.
Repeated enumeration of group settings pages across multiple groups by a single authenticated session.
Unexpected access from service or automation accounts that historically do not read group configuration.

Detection Strategies

Review GitLab production and audit logs for HTTP 200 responses on the affected group settings page returned to users without the expected group role.
Correlate authenticated session identifiers with group membership data to flag access attempts that exceed the user's role.
Baseline normal access patterns to group configuration pages and alert on deviations from that baseline.

Monitoring Recommendations

Ingest GitLab audit events into a centralized logging or SIEM platform for retention and correlation.
Enable and forward GitLab's built-in audit events for group configuration reads and administrative page access.
Track version metadata across GitLab instances to identify hosts still running vulnerable releases.

How to Mitigate CVE-2026-18244

Immediate Actions Required

Upgrade GitLab EE to 19.0.6, 19.1.4, 19.2.2, or later according to the deployed release branch.
Inventory GitLab EE instances and confirm the running version to identify unpatched systems.
Review recent access logs for the affected group settings page to identify potential unauthorized reads.

Patch Information

GitLab released fixed versions 19.0.6, 19.1.4, and 19.2.2. Details are documented in the GitLab Patch Release Notes. Administrators should follow GitLab's standard upgrade procedure for their deployment method (Omnibus, Helm chart, source, or GitLab Dedicated).

Workarounds

Restrict account creation and review existing group memberships to reduce the population of users able to exercise the flaw until patching completes.
Limit network exposure of the GitLab instance to trusted networks where feasible to reduce the attacker pool.
Audit and remove unnecessary user accounts and dormant sessions to shrink the authenticated attack surface.

bash

# Verify installed GitLab version (Omnibus)
sudo gitlab-rake gitlab:env:info | grep -i "GitLab information" -A 5

# Upgrade GitLab (Omnibus, Debian/Ubuntu)
sudo apt-get update && sudo apt-get install gitlab-ee=19.2.2-ee.0

# Upgrade GitLab (Omnibus, RHEL/CentOS)
sudo yum install gitlab-ee-19.2.2-ee.0