# CVE-2026-4398: Authorization Bypass Through User-Controlled Key in GitLab

> CVE-2026-4398: Authorization Bypass Through User-Controlled Key in GitLab. CVSS 5.4 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-4398
Last updated: 2026-09-28T19:09:33Z

- Published: 2026-08-27 17:53 UTC · Updated: 2026-09-28 19:09 UTC · Assigner: GitLab
- CVSS: 5.4 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
- EPSS: 0.24%, 15th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-639

## Description

GitLab has remediated an issue in GitLab EE affecting all versions from 18.3 before 19.1.7, 19.2 before 19.2.5, and 19.3 before 19.3.1 that, under certain conditions, an authenticated user could have assigned compliance frameworks from namespaces they were not authorized to access to their own project, due to missing namespace validation on self-managed instances.

## 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-2026-4398)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-4398)
- [https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/](https://docs.gitlab.com/releases/patches/patch-release-gitlab-19-3-1-released/)
- [https://gitlab.com/gitlab-org/gitlab/-/work\_items/600360](https://gitlab.com/gitlab-org/gitlab/-/work_items/600360)
- [https://hackerone.com/reports/3549150](https://hackerone.com/reports/3549150)

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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-2026-4398 · Markdown: https://rewindex.com/cve/CVE-2026-4398.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-4398 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:13:41.924Z