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CVE-2026-3307— Authorization bypass in GitHub Enterprise Server secret scanning push protection allows cross-repository modification of delegated bypass reviewers

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，该漏洞源于授权绕过，可能导致具有一个仓库管理员访问权限的攻击者通过操纵请求体中的owner_id参数修改另一个仓库的秘密扫描推送保护委托绕过审查者列表。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.27% · P19

Possible ATT&CK Techniques 1 AI

T1098.004 · SSH Authorized Keys
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I. Basic Information for CVE-2026-3307

Vulnerability Information
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Vulnerability Title
Authorization bypass in GitHub Enterprise Server secret scanning push protection allows cross-repository modification of delegated bypass reviewers
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed an attacker with admin access on one repository to modify the secret scanning push protection delegated bypass reviewer list on another repository by manipulating the owner_id parameter in the request body. Authorization was verified against the repository in the URL, but the action was applied to a different repository specified in the request body. The impact is limited to assigning existing trusted users as bypass reviewers; it does not allow adding arbitrary external users. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.14.25, 3.15.20, 3.16.16, 3.17.13, 3.18.7, 3.19.4 and 3.20.1. 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
通过用户控制密钥绕过授权机制
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，该漏洞源于授权绕过，可能导致具有一个仓库管理员访问权限的攻击者通过操纵请求体中的owner_id参数修改另一个仓库的秘密扫描推送保护委托绕过审查者列表。
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 ~ 3.14.24 -

II. Public POCs for CVE-2026-3307

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III. Intelligence Information for CVE-2026-3307

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Vendor Pages for CVE-2026-3307 (1)

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

CVE-2026-4296 Incorrect Regular Expression vulnerability in GitHub Enterprise Server allowed unauthorize
CVE-2026-5512 Improper authorization vulnerability in GitHub Enterprise Server allowed disclosure of pri
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-639

V. Comments for CVE-2026-3307

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