CVE-2024-1347: Authentication Bypass by Spoofing in GitLab

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-04-25 · updated 2026-06-17
Weakness: CWE-290

Description

An issue has been discovered in GitLab CE/EE affecting all versions before 16.9.6, all versions starting from 16.10 before 16.10.4, all versions starting from 16.11 before 16.11.1. Under certain conditions, an attacker through a crafted email address may be able to bypass domain based restrictions on an instance or a group.

Affected products

GitLab: before 16.9.6; from 16.10.0 before 16.10.4; 16.11.0 — fixed in 16.10.4, 16.9.6

How to fix

Upgrade to a fixed version: GitLab 16.10.4, 16.9.6. Check the vendor advisory for mitigations.

References

https://gitlab.com/gitlab-org/gitlab/-/issues/441093
https://hackerone.com/reports/2355565
https://gitlab.com/gitlab-org/gitlab/-/issues/441093
https://hackerone.com/reports/2355565

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