CVE-2026-5296: Missing Authorization 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: 2026-05-27 · updated 2026-10-14
Weakness: CWE-862

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 18.7 before 18.10.7, 18.11 before 18.11.4, and 19.0 before 19.0.1 that when foundational flows were enabled at the group level, could have allowed an authenticated user with developer-role permissions to bypass flow restrictions under certain conditions.

Affected products

GitLab: from 18.7.0 before 18.10.7; from 18.11.0 before 18.11.4; 19.0.0 — fixed in 18.10.7, 18.11.4

How to fix

Upgrade to a fixed version: GitLab 18.10.7, 18.11.4. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2026/05/27/patch-release-gitlab-19-0-1-released/
https://gitlab.com/gitlab-org/gitlab/-/work_items/595423
https://hackerone.com/reports/3626303

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