# CVE-2026-5512: Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API

> CVE-2026-5512: Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API. CVSS 4.3 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-5512
Last updated: 2026-06-17T10:59:08Z

- Published: 2026-04-21 22:12 UTC · Updated: 2026-06-17 10:59 UTC · Assigner: GitHub\_P
- CVSS: 4.3 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- EPSS: 0.30%, 22th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-201

## Description

An improper authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated attacker to determine the names of private repositories by their numeric ID. The mobile upload policy API endpoint did not perform an early authorization check, and validation error messages included the full repository name for repositories the caller did not have access to. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.1, 3.19.5, 3.18.8, 3.17.14, 3.16.17, 3.15.21, and 3.14.26. This vulnerability was reported via the GitHub Bug Bounty program.

## Affected vendors and products

- GitHub: Enterprise Server

## Tracked companies

- [GitHub](https://rewindex.com/company/github.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-5512)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-5512)
- [https://docs.github.com/en/enterprise-server@3.14/admin/release-notes\#3.14.26](https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.26)
- [https://docs.github.com/en/enterprise-server@3.15/admin/release-notes\#3.15.21](https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.21)
- [https://docs.github.com/en/enterprise-server@3.16/admin/release-notes\#3.16.17](https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.17)
- [https://docs.github.com/en/enterprise-server@3.17/admin/release-notes\#3.17.14](https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.14)
- [https://docs.github.com/en/enterprise-server@3.18/admin/release-notes\#3.18.8](https://docs.github.com/en/enterprise-server@3.18/admin/release-notes#3.18.8)
- [https://docs.github.com/en/enterprise-server@3.19/admin/release-notes\#3.19.5](https://docs.github.com/en/enterprise-server@3.19/admin/release-notes#3.19.5)
- [https://docs.github.com/en/enterprise-server@3.20/admin/release-notes\#3.20.1](https://docs.github.com/en/enterprise-server@3.20/admin/release-notes#3.20.1)

---

_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/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-5512 · Markdown: https://rewindex.com/cve/CVE-2026-5512.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-5512 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T04:04:05.824Z