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

Quick assessment

Affected
GitHub Enterprise Server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.21之前版本存在安全漏洞，该漏洞源于移动上传策略API端点授权不当，可能导致经过身份验证的攻击者通过数字ID确定私有仓库名称。

AI Predicted 5.3 Difficulty: Easy EPSS 0.50% · P40

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery
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I. Basic Information for CVE-2026-5512

Vulnerability Information
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Vulnerability Title
Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository names via mobile upload policy API
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过发送数据的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub Enterprise Server是美国GitHub开源的一个应用软件。提供一个将自己的GitHub实例设置为虚拟设备，从而提供可扩展，易于管理的平台。 GitHub Enterprise Server 3.21之前版本存在安全漏洞，该漏洞源于移动上传策略API端点授权不当，可能导致经过身份验证的攻击者通过数字ID确定私有仓库名称。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GitHub Enterprise Server 3.14.0 ~ 3.14.25 -

II. Public POCs for CVE-2026-5512

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III. Intelligence Information for CVE-2026-5512

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Vendor Pages for CVE-2026-5512 (1)

Same Patch Batch · GitHub · 2026-04-21 · 5 CVEs total

CVE-2026-3307 Authorization bypass in GitHub Enterprise Server secret scanning push protection allows cr
CVE-2026-4296 Incorrect Regular Expression vulnerability in GitHub Enterprise Server allowed unauthorize
CVE-2026-5921 Server-Side Request Forgery in GitHub Enterprise Server allowed extraction of sensitive en
CVE-2026-5845 Improper authorization fallback allows scoped user-to-server token installation escape in

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-201

V. Comments for CVE-2026-5512

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