CVE-2025-6171: gitlab Auth Bypass — Fix

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.2 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker with reporter access to view branch names and pipeline details by accessing the packages API endpoint even when repository access was disabled.

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CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-862 Missing Authorization

Affected Products

Vendor	Product	Versions
gitlab	gitlab	13.2.0 — 18.3.6
gitlab	gitlab	13.2.0 — 18.3.6
gitlab	gitlab	18.4.0 — 18.4.4
gitlab	gitlab	18.4.0 — 18.4.4
gitlab	gitlab	18.5.0 — 18.5.2
gitlab	gitlab	18.5.0 — 18.5.2

References

Advisories & Patches

https://about.gitlab.com/releases/2025/11/12/patch-release-gitlab-18-5-2-released/

Other References

https://gitlab.com/gitlab-org/gitlab/-/issues/549730 https://hackerone.com/reports/3183740

Frequently Asked Questions

What is CVE-2025-6171? +

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 13.2 before 18.3.6, 18.4 before 18.4.4, and 18.5 before 18.5.2 that could have allowed an authenticated attacker with reporter access to view branch names and pipeline details by accessing the packages API endpoint even when repository access was disabled. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2025-6171? +

CVE-2025-6171 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-6171? +

CVE-2025-6171 affects products from gitlab, specifically: gitlab. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-6171? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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