CVE-2026-9268: GitLab Authorization Bypass Vulnerability

CVE-2026-9268 Overview

CVE-2026-9268 is a broken access control vulnerability [CWE-863] affecting GitLab Enterprise Edition (EE). The flaw allows an authenticated user with limited permissions to modify project CI/CD deployment rollback settings without proper authorization. GitLab remediated the issue in versions 19.2.8, 19.3.5, and 19.4.2. The vulnerability affects all GitLab EE releases from 13.6 onward until the patched versions.

The root cause is insufficient access control checks on the deployment rollback configuration endpoint. Exploitation requires valid authenticated credentials but no user interaction.

Critical Impact
Authenticated low-privilege users can tamper with CI/CD deployment rollback settings, undermining the integrity of release and recovery workflows.

Affected Products

GitLab Enterprise Edition versions 13.6 through 19.2.7
GitLab Enterprise Edition versions 19.3 through 19.3.4
GitLab Enterprise Edition versions 19.4 through 19.4.1

Discovery Timeline

2026-10-13 - CVE-2026-9268 published to NVD
2026-10-14 - Last updated in NVD database

Technical Details for CVE-2026-9268

Vulnerability Analysis

The vulnerability is an authorization flaw in GitLab EE's project settings management. Specifically, the controller that handles CI/CD deployment rollback configuration does not fully verify that the requesting user holds the project role required to change those settings.

GitLab uses role-based access control to gate project configuration changes. In the affected code path, the authorization check accepts users whose project role should not include permission to alter deployment rollback behavior. The result is an integrity issue that lets a limited-permission collaborator influence how deployments are rolled back.

Tampering with rollback settings can disrupt safe release practices. An attacker could disable automatic rollback protections or alter rollback targets, increasing the risk that a bad deployment remains in production.

Root Cause

The underlying weakness is classified as [CWE-863] Incorrect Authorization. The affected endpoint relied on an incomplete permission check, allowing roles below Maintainer to persist changes to deployment rollback configuration. Proper enforcement requires validating both the user's project role and the specific capability tied to CI/CD settings modification.

Attack Vector

Exploitation occurs over the network against a reachable GitLab EE instance. The attacker needs an authenticated account with at least limited access to the target project. No user interaction and no elevated privileges are required.

An attacker with Reporter or Developer-level access could issue a crafted API or UI request against the deployment rollback settings endpoint. The server accepts the request and persists the modification without rejecting the under-privileged caller.

No public proof-of-concept, exploit module, or in-the-wild exploitation has been reported. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Detection Methods for CVE-2026-9268

Indicators of Compromise

Unexpected modifications to project CI/CD deployment rollback configuration performed by users below Maintainer role.
Audit log entries referencing deployment rollback setting changes from accounts that historically do not manage project settings.
API requests to project settings endpoints originating from unusual IP addresses or service tokens tied to limited-permission users.

Detection Strategies

Review GitLab audit events for project_settings changes correlated with user role at the time of the change.
Compare current deployment rollback configuration against a known-good baseline across all projects.
Alert on configuration drift in CI/CD pipelines, especially changes to automatic rollback behavior that were not initiated through a change-management process.

Monitoring Recommendations

Forward GitLab application and audit logs to a centralized analytics platform and retain them long enough to cover the exposure window.
Build detections that flag write operations to CI/CD project settings by Reporter or Developer accounts.
Track authentication events for service accounts and personal access tokens that can reach project settings APIs.

How to Mitigate CVE-2026-9268

Immediate Actions Required

Upgrade GitLab EE to version 19.4.2, 19.3.5, or 19.2.8, selecting the branch that matches your current deployment.
Audit project CI/CD deployment rollback settings for unauthorized modifications since the earliest potentially affected release in your environment.
Review project membership and reduce roles that are broader than business needs require.

Patch Information

GitLab released fixes in versions 19.2.8, 19.3.5, and 19.4.2. Patch details and upgrade guidance are available in the GitLab Patch Release 19.4.2 advisory. Additional technical context is tracked in GitLab Work Item #600934 and HackerOne Report #3687442.

Workarounds

Restrict project membership so that only trusted users hold Reporter or Developer roles on projects with sensitive deployment pipelines until patching is complete.
Enforce protected environments and require Maintainer approval for deployments to production environments.
Rotate personal access tokens and project access tokens that may have been exposed to low-trust collaborators.

bash

# Verify the installed GitLab version after upgrade
sudo gitlab-rake gitlab:env:info | grep "GitLab information" -A 5

# Example: check deployment rollback settings via the API for a given project
curl --header "PRIVATE-TOKEN: $GITLAB_TOKEN" \
  "https://gitlab.example.com/api/v4/projects/<project_id>"