CVE-2026-1747: Authentication Bypass Using an Alternate Path or Channel in GitLab

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-25 · updated 2026-06-17
Weakness: CWE-288

Description

GitLab has remediated an issue in GitLab EE affecting all versions from 17.11 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that, under certain conditions, could have allowed Developer-role users with insufficient privileges to make unauthorized modifications to protected Conan packages.

Affected products

GitLab: from 17.11.0 before 18.7.5; from 18.8.0 before 18.8.5; 18.9.0 — fixed in 18.7.5, 18.8.5

How to fix

Upgrade to a fixed version: GitLab 18.7.5, 18.8.5. Check the vendor advisory for mitigations.

References

https://about.gitlab.com/releases/2026/02/25/patch-release-gitlab-18-9-1-released/
https://gitlab.com/gitlab-org/gitlab/-/issues/588385
https://hackerone.com/reports/3533088

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