CVE-2026-4523: Missing Authorization in GitLab

Severity: low (CVSS 3.7 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: 2026-09-29 · updated 2026-10-05
Weakness: CWE-862

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.11 before 19.2.7, 19.3 before 19.3.3, and 19.4 before 19.4.1 that under certain conditions could have allowed an unauthenticated user to read CI/CD job trace contents containing sensitive variable values due to improper authorization enforcement in the GraphQL API.

Affected products

GitLab: from 15.11.0 before 19.2.7; from 19.3.0 before 19.3.3; 19.4.0 — fixed in 19.2.7, 19.3.3

How to fix

Upgrade to a fixed version: GitLab 19.2.7, 19.3.3. Check the vendor advisory for mitigations.

References

https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-4-1-released/
https://gitlab.com/gitlab-org/gitlab/-/work_items/594294
https://hackerone.com/reports/3590929

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