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CVE-2026-14340— An incorrect authorization vulnerability in GitHub Enterprise Server allows issue creation in unrelated public repositories

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 3.22之前版本存在授权问题漏洞，该漏洞源于授权检查不正确，只验证目标仓库的读取权限而未验证令牌安装是否显式拥有该仓库访问权限，攻击者获取受害者的用户到服务器令牌后可在任何公共仓库上创建问题、评论等写操作。以下版本受到影响：3.16.0版本至3.16.19版本、3.17.0版本至3.17.16版本、3.18.0版本至3.18.10版本、3.19.0版本至

AI Predicted 7.5 Difficulty: Easy EPSS 0.43% · P35

Affected Version Matrix 6

VendorProduct Version RangeStatus
GitHub Enterprise Server 3.16.0≤ 3.16.19 affected
3.17.0≤ 3.17.16 affected
3.18.0≤ 3.18.10 affected
3.19.0≤ 3.19.7 affected
3.20.0≤ 3.20.3 affected
3.21.0≤ 3.21.1 affected
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I. Basic Information for CVE-2026-14340

Vulnerability Information
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Vulnerability Title
An incorrect authorization vulnerability in GitHub Enterprise Server allows issue creation in unrelated public repositories
Source: CVE Program / CVE List V5
Vulnerability Description
An incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed a user-to-server token scoped to a GitHub App installation to perform certain write operations on public repositories outside the token's intended scope. This was possible because the authorization check only verified that the installation had read permissions on the target repository rather than verifying that the token's installation was explicitly granted access to that repository. An attacker who obtained a victim's user-to-server token could create issues, issue comments, commit comments, and private vulnerability reports on any public repository, appearing as the victim user with no indication of the app involvement. This vulnerability was fixed by adding a repository scope check for user-to-server tokens issued by global apps. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.21.2, 3.20.4, 3.19.8, 3.18.11, 3.17.17, 3.16.20. 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:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
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 3.22之前版本存在授权问题漏洞，该漏洞源于授权检查不正确，只验证目标仓库的读取权限而未验证令牌安装是否显式拥有该仓库访问权限，攻击者获取受害者的用户到服务器令牌后可在任何公共仓库上创建问题、评论等写操作。以下版本受到影响：3.16.0版本至3.16.19版本、3.17.0版本至3.17.16版本、3.18.0版本至3.18.10版本、3.19.0版本至
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 3.16.0 ~ 3.16.19 -

II. Public POCs for CVE-2026-14340

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III. Intelligence Information for CVE-2026-14340

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Vendor Pages for CVE-2026-14340 (4)

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-863

V. Comments for CVE-2026-14340

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