title: Improper Access Control in GitLab
description: An issue has been discovered in Ultimate-licensed GitLab EE affecting all versions starting 13.12 prior to 16.2.8, 16.3.0 prior to 16.3.5, and 16.4.0 prior to 16.4.1 that could allow an attacker to impersonate users in CI pipelines through direct transfer group imports.
problem types: CWE-284: Improper Access Control
affected:
{
vendor: GitLab
product: GitLab
repo: git://git@gitlab.com:gitlab-org/gitlab.git
versions:
version: 13.12, status: affected, lessThan: 16.2.8, versionType: semver
version: 16.3.0, status: affected, lessThan: 16.3.5, versionType: semver
version: 16.4.0, status: affected, lessThan: 16.4.1, versionType: semver
defaultStatus: unaffected
}
metrics:
format: CVSS
scenarios: GENERAL
cvssV3_1: [
version: 3.1
vectorString: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
attackVector: NETWORK
attackComplexity: HIGH
privilegesRequired: LOW
userInteraction: NONE
scope: CHANGED
confidentialityImpact: HIGH
integrityImpact: HIGH
availabilityImpact: NONE
baseScore: 8.2
baseSeverity: HIGH
]
solutions: Upgrade to version 16.2.8, 16.3.5, 16.4.1. If it is not viable to immediately upgrade to a patched version, risk of exploitation can be mitigated by ensuring the [Migrate groups by direct transfer](https://docs.gitlab.com/ee/user/group/import/index.html#migrate-groups-by-direct-transfer-recommended) feature is disabled until GitLab has been upgraded.