CVE-2023-3914: Incorrect User Management in GitLab

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-09-29 · updated 2026-06-17
Weakness: CWE-286

Description

A business logic error in GitLab EE affecting all versions prior to 16.2.8, 16.3 prior to 16.3.5, and 16.4 prior to 16.4.1 allows access to internal projects. A service account is not deleted when a namespace is deleted, allowing access to internal projects.

Affected products

GitLab: before 16.2.8; from 16.3.0 before 16.3.5; 16.4.0 — fixed in 16.2.8, 16.3.5

How to fix

Upgrade to a fixed version: GitLab 16.2.8, 16.3.5. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/418115
https://hackerone.com/reports/2040822
https://gitlab.com/gitlab-org/gitlab/-/issues/418115
https://hackerone.com/reports/2040822

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