CVE-2026-3074: Authorization Bypass Through User-Controlled Key in GitLab

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-14 · updated 2026-06-17
Weakness: CWE-639

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 16.7 before 18.9.7, 18.10 before 18.10.6, and 18.11 before 18.11.3 that could have allowed an unauthenticated user to download private debugging symbols from inaccessible projects due to improper access control.

Affected products

GitLab: from 16.7.0 before 18.9.7; from 18.10.0 before 18.10.6; from 18.11.0 before 18.11.3 — fixed in 18.10.6, 18.11.3, 18.9.7

How to fix

Upgrade to a fixed version: GitLab 18.10.6, 18.11.3, 18.9.7. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2026/05/13/patch-release-gitlab-18-11-3-released/
https://gitlab.com/gitlab-org/gitlab/-/work_items/591229
https://hackerone.com/reports/3556163

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