CVE-2026-13319

Authorization Bypass Through User-Controlled Key in GitLab

GitLab GitLabApplications & CMS

CVSS

4.3Medium

ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV

Exploit odds (EPSS)0.22%Chance of exploitation activity in the next 30 days, higher than 11% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed in19.3.6Also 19.4.3, 19.5.1CVE List

Published21 Oct 2026Updated 21 Oct 2026CVE List

What fixes it

19.3.6GitLabCVE List
19.4.3GitLabCVE List
19.5.1GitLabCVE List

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Reports 1

1 outlet mention it. Reports are not confirmation; each links to its source.

GitLab Critical Patch Release: 19.5.1, 19.4.3, 19.3.6, 19.2.9, 19.1.9, 19.0.10, 18.11.13GitLab releases, 21 Oct 2026

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 15.10 before 19.3.6, 19.4 before 19.4.3, and 19.5 before 19.5.1 that, could have allowed an authenticated to read milestone metadata, including titles, descriptions, and full project paths, from arbitrary private projects across the instance without any project membership, due to missing authorization checks on a user-supplied project filter parameter in the group milestones API.

Text from CVE List

Affected versions 3

GitLabaffected: 15.10 before 19.3.6CVE List
GitLabaffected: 19.4 before 19.4.3CVE List
GitLabaffected: 19.5 before 19.5.1CVE List