CVE-2026-15783— Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed reading private repository metadata via delegated bypass rule suites
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公司的一款一座企业级代码托管服务器。 GitHub Enterprise Server存在授权问题漏洞，该漏洞源于授权缺失，未验证请求用户对规则库仓库的读取权限，可能导致已验证用户通过编码标识符枚举私有仓库元数据。以下版本受到影响：3.17.0版本至3.17.17版本、3.18.0版本至3.18.11版本、3.19.0版本至3.19.8版本、3.20.0版本至3.20.4版本和3.21.0版本至3.21.2版本。
Affected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| GitHub | Enterprise Server | 3.17.0≤ 3.17.17 |
affected |
3.18.0≤ 3.18.11 |
affected | ||
3.19.0≤ 3.19.8 |
affected | ||
3.20.0≤ 3.20.4 |
affected | ||
3.21.0≤ 3.21.2 |
affected |
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I. Basic Information for CVE-2026-15783
Vulnerability Information
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Vulnerability Title
Missing Authorization vulnerability was identified in GitHub Enterprise Server that allowed reading private repository metadata via delegated bypass rule suites
Source: CVE Program / CVE List V5
Vulnerability Description
A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user with write access to any repository to read metadata from private repositories they did not have access to, including private repository owners and names, branch names, commit SHAs, commit messages, and the pushing actor. The delegated bypass endpoint resolved a rule suite directly from an attacker-supplied, encoded identifier without verifying that the requesting user could read the rule suite's repository, and because these identifiers are sequential an attacker could enumerate them across the instance. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.18, 3.18.12, 3.19.9, 3.20.5, and 3.21.3. 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:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub enterprise server是美国GitHub公司的一款一座企业级代码托管服务器。 GitHub Enterprise Server存在授权问题漏洞，该漏洞源于授权缺失，未验证请求用户对规则库仓库的读取权限，可能导致已验证用户通过编码标识符枚举私有仓库元数据。以下版本受到影响：3.17.0版本至3.17.17版本、3.18.0版本至3.18.11版本、3.19.0版本至3.19.8版本、3.20.0版本至3.20.4版本和3.21.0版本至3.21.2版本。
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 | 3.17.0 ~ 3.17.17 | - |
|
II. Public POCs for CVE-2026-15783
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|---|
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Same Patch Batch · GitHub · 2026-07-17 · 4 CVEs total
| CVE-2026-54163 | 4.7 MEDIUM | secure_headers: CSP directive injection via sandbox, plugin_types, and report_to when give |
| CVE-2026-15343 | Path traversal vulnerability in GitHub Enterprise Server allowed writing files to arbitrar | |
| CVE-2026-15007 | Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via |
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V. Comments for CVE-2026-15783
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