CVE-2026-13319

Authorization Bypass Through User-Controlled Key in GitLab

State: Published
Severity: 4.3 Medium
Published: Oct 21, 2026
Updated: Oct 30, 2026
Reserved: Jun 25, 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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	GitLab

Weaknesses

CWE-639 Authorization Bypass Through User-Controlled Key

Affected Products

Product	Versions
GitLabGitLab	15.10 to before 19.3.6Affected 19.4 to before 19.4.3Affected 19.5 to before 19.5.1Affected

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/604064
HackerOne Bug Bounty Report #3792168technical-descriptionexploitpermissions-required
https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-5-1-released/

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