CVE-2023-3907: Improper User Management in GitLab

Severity: high (CVSS 8.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-17 · updated 2026-06-17
Weakness: CWE-286

Description

A privilege escalation vulnerability in GitLab EE affecting all versions from 16.0 prior to 16.4.4, 16.5 prior to 16.5.4, and 16.6 prior to 16.6.2 allows a project Maintainer to use a Project Access Token to escalate their role to Owner

Affected products

GitLab: from 16.0.0 before 16.4.4; from 16.5 before 16.5.4; from 16.6 before 16.6.2 — fixed in 16.4.4, 16.5.4, 16.6.2

How to fix

Upgrade to a fixed version: GitLab 16.4.4, 16.5.4, 16.6.2. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/418878
https://hackerone.com/reports/2058934
https://gitlab.com/gitlab-org/gitlab/-/issues/418878
https://hackerone.com/reports/2058934

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