# CVE-2025-12653: Authentication Bypass by Spoofing in GitLab

> CVE-2025-12653: Authentication Bypass by Spoofing in GitLab. CVSS 6.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-12653
Last updated: 2026-10-18T20:10:00Z

- Published: 2025-11-26 19:46 UTC · Updated: 2026-10-18 20:10 UTC · Assigner: GitLab
- CVSS: 6.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS: 0.29%, 21th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-290

## 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.

## Affected vendors and products

- GitLab: GitLab

## Tracked companies

- [GitLab](https://rewindex.com/company/gitlab.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-12653)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2025-12653)
- [https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/](https://about.gitlab.com/releases/2025/11/26/patch-release-gitlab-18-6-1-released/)
- [https://gitlab.com/gitlab-org/gitlab/-/issues/579372](https://gitlab.com/gitlab-org/gitlab/-/issues/579372)
- [https://hackerone.com/reports/3370245](https://hackerone.com/reports/3370245)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-12653 · Markdown: https://rewindex.com/cve/CVE-2025-12653.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-12653 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:11:07.600Z