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CVE-2026-6736— Authentication bypass vulnerability in GitHub Enterprise Server allowed creation of local user accounts bypassing the configured external identity provider

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之前版本存在访问控制错误漏洞，该漏洞源于注册端点未正确执行外部身份验证限制，可能导致未经身份验证的攻击者绕过身份验证创建本地用户账户并建立会话。

AI Predicted 9.0 Difficulty: Easy EPSS 0.41% · P33

Possible ATT&CK Techniques 1 AI

T1199 · Trusted Relationship

Affected Version Matrix 5

VendorProduct Version RangeStatus
GitHub Enterprise Server 3.16.0≤ 3.16.17 affected
3.17.0≤ 3.17.14 affected
3.18.0≤ 3.18.8 affected
3.19.0≤ 3.19.5 affected
3.20.0≤ 3.20.1 affected
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I. Basic Information for CVE-2026-6736

Vulnerability Information
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Vulnerability Title
Authentication bypass vulnerability in GitHub Enterprise Server allowed creation of local user accounts bypassing the configured external identity provider
Source: CVE Program / CVE List V5
Vulnerability Description
An authentication bypass vulnerability was identified in GitHub Enterprise Server that allowed an unauthenticated attacker to create a local user account, bypassing the configured external identity provider. When external authentication was enabled, the signup endpoint did not properly enforce the authentication restriction, allowing account creation and session establishment without identity provider validation. The created account was limited to the default base permissions configured on the instance. Exploitation required network access to a GHES instance configured with an external authentication provider. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.20.2, 3.19.6, 3.18.9, 3.17.15, and 3.16.18.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 访问控制错误漏洞
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之前版本存在访问控制错误漏洞，该漏洞源于注册端点未正确执行外部身份验证限制，可能导致未经身份验证的攻击者绕过身份验证创建本地用户账户并建立会话。
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 ~ 3.16.17 -

II. Public POCs for CVE-2026-6736

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III. Intelligence Information for CVE-2026-6736

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Same Patch Batch · GitHub · 2026-05-07 · 4 CVEs total

CVE-2026-7541 Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via
CVE-2026-8106 Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console logi
CVE-2026-8034 Server-side request forgery vulnerability in GitHub Enterprise Server notebook viewer via

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-306

V. Comments for CVE-2026-6736

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