CVE-2025-12653

Description

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests.

CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-290 CWE-290

Affected Products

Vendor	Product	Versions
gitlab	gitlab	18.3.0 — 18.4.5
gitlab	gitlab	18.3.0 — 18.4.5
gitlab	gitlab	18.5.0 — 18.5.3
gitlab	gitlab	18.5.0 — 18.5.3
gitlab	gitlab	All
gitlab	gitlab	All

References

Other References

https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/ https://gitlab.com/gitlab-org/gitlab/-/issues/579372 https://hackerone.com/reports/3370245

Frequently Asked Questions

What is CVE-2025-12653? +

GitLab has remediated an issue in GitLab CE/EE affecting all versions from 18.3 before 18.4.5, 18.5 before 18.5.3, and 18.6 before 18.6.1 that under specific conditions could have allowed an unauthenticated user to join arbitrary organizations by changing headers on some requests. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-12653? +

CVE-2025-12653 has a CVSS v3.1 score of 6.5 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-2025-12653? +

CVE-2025-12653 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-2025-12653? +

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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