CVE-2023-5106: Incorrect Authorization in GitLab

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-10-02 · updated 2026-06-17
Weakness: CWE-863

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.

Affected products

GitLab: from 13.12 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/-/commit/67039cfcae80b8fc0496f79be88714873cd169b3
https://gitlab.com/gitlab-org/security/gitlab/-/issues/980
https://gitlab.com/gitlab-org/gitlab/-/commit/67039cfcae80b8fc0496f79be88714873cd169b3

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