CVE-2026-9807: Incorrect 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: 2026-05-28 · updated 2026-10-14
Weakness: CWE-863

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.9 before 18.10.7, 18.11 before 18.11.4, and 19.0 before 19.0.1 that under certain conditions could have allowed a blocked Project Access Token to continue accessing private resources due to incorrect authorization enforcement.

Affected products

GitLab: from 18.9.0 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/590694
https://hackerone.com/reports/3554993

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