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CVE-2026-8106— Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft

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 3.19.1版本至3.19.5版本和3.20.0版本至3.20.1版本存在跨站脚本漏洞，该漏洞源于管理控制台登录页面中redirect_to参数反射到HTML属性且清理不当，可能导致反射型HTML注入攻击，进而窃取凭据。

AI Predicted 5.4 Difficulty: Trivial EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 4

VendorProduct Version RangeStatus
GitHub Enterprise Server 3.19.1≤ 3.19.5 affected
3.20.0≤ 3.20.1 affected
3.19.0 unaffected
3.21.0 unaffected
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I. Basic Information for CVE-2026-8106

Vulnerability Information
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Vulnerability Title
Reflected HTML injection vulnerability in GitHub Enterprise Server Management Console login page allowed credential theft
Source: CVE Program / CVE List V5
Vulnerability Description
A reflected HTML injection vulnerability was identified in the GitHub Enterprise Server Management Console login page that could allow credential theft. The redirect_to query parameter on the /setup/unlock endpoint was reflected into an HTML attribute without proper sanitization, enabling an attacker to inject a form element that could capture administrator credentials. Exploitation required an administrator to click a crafted link and enter their credentials. This vulnerability affected GitHub Enterprise Server versions 3.19.1 through 3.19.5 and 3.20.0 through 3.20.1, and was fixed in versions 3.19.6 and 3.20.2. 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:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub Enterprise Server 跨站脚本漏洞
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 3.19.1版本至3.19.5版本和3.20.0版本至3.20.1版本存在跨站脚本漏洞，该漏洞源于管理控制台登录页面中redirect_to参数反射到HTML属性且清理不当，可能导致反射型HTML注入攻击，进而窃取凭据。
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 3.19.1 ~ 3.19.5 -

II. Public POCs for CVE-2026-8106

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III. Intelligence Information for CVE-2026-8106

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

CVE-2026-6736 Authentication bypass vulnerability in GitHub Enterprise Server allowed creation of local
CVE-2026-7541 Denial of service vulnerability in GitHub Enterprise Server allowed service disruption via
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-79

V. Comments for CVE-2026-8106

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