CVE-2026-6277: GitLab EE Security Configuration Authorization Bypass

Technical summary

CVE-2026-6277 is an improper authorization enforcement vulnerability in GitLab EE (CWE-863). The flaw permits authenticated Security Manager-role users to perform administrative actions on project security configuration without proper authorization checks when the feature toggle is disabled. The vulnerability stems from insufficient authorization logic that fails to respect the disabled state of the relevant security management feature, allowing privilege escalation within the role's intended scope.

Business impact

Organizations using GitLab EE may experience unauthorized modification of security policies and configurations by privileged users. This creates compliance and audit risks, as security settings can be altered by users who should not have that capability in certain contexts. The impact is heightened in multi-tenant or regulated environments where separation of duties and feature controls are critical to governance.

Affected systems

GitLab EE is affected across a wide version range: 13.9 through 18.10.7, 18.11.0 through 18.11.4, and 19.0.0 through 19.0.1. Organizations running GitLab Community Edition (CE) are not impacted. The vulnerability requires the user to already be authenticated and hold Security Manager role permissions, limiting the attack surface to internal or provisioned accounts.

Exploitability

Exploitation requires valid authentication and Security Manager role assignment. No user interaction is needed and the flaw is accessible over the network. While the barrier to exploitation is moderate due to the authentication requirement and specific role dependency, the attack is straightforward once those conditions are met. The vulnerability is not currently tracked in CISA's Known Exploited Vulnerabilities catalog.

Remediation

Upgrade GitLab EE to version 18.10.8 or later, 18.11.5 or later, or 19.0.2 or later depending on your current major version. Review and audit Security Manager role assignments to identify and restrict unnecessary privilege grants. Consider implementing additional access controls or monitoring on security configuration changes as a compensating control during patch deployment.

Patch guidance

Apply the latest available patch matching your deployment: version 18.10.8+, 18.11.5+, or 19.0.2+. Test patching in a staging environment first to confirm compatibility with custom security policies or integrations. Roll out patches to production on a schedule that prioritizes instances with sensitive or regulated projects. Verify that security configuration features respect their intended disabled state post-patch by testing with a Security Manager role account.

Detection guidance

Monitor audit logs for security configuration changes initiated by Security Manager-role users, particularly any modifications occurring when the feature should be disabled. Look for unauthorized edits to project-level security policies, scanning configurations, or policy enforcement settings. Compare intended feature toggle state against actual configuration state to identify when the disabled flag is not being honored. Review role-to-capability mappings to ensure Security Manager users are only accessing expected resources.

Why prioritize this

While the CVSS score of 4.3 (MEDIUM) reflects limited immediate impact, the integrity risk and potential for compliance violations warrant prompt patching. Prioritize instances where Security Manager roles are assigned to multiple users, particularly in regulated industries. Organizations with strict change control policies should accelerate remediation because this flaw enables unauthorized security policy modification, bypassing intended governance controls.

Risk score, explained

CVSS 3.1 score of 4.3 (MEDIUM severity) reflects: network-accessible attack vector, low attack complexity (no special conditions), required privilege level (authenticated user with specific role), and integrity impact (ability to modify security configuration). Confidentiality and availability are not affected. The score is tempered by the authentication requirement and role-specific scope, but the integrity impact of unauthorized security policy changes elevates concern beyond the numeric severity alone.

Frequently asked questions