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CVE-2026-9132— Missing authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository contents via the Copilot pull request diff summary endpoint

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 3.21之前版本存在授权问题漏洞，该漏洞源于授权缺失，可能导致经过身份认证的用户通过Copilot pull request description diff summary端点读取其无权访问的私有代码库中的源代码。

AI Predicted 6.5 Difficulty: Easy EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 4

VendorProduct Version RangeStatus
GitHub Enterprise Server 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
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I. Basic Information for CVE-2026-9132

Vulnerability Information
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Vulnerability Title
Missing authorization vulnerability in GitHub Enterprise Server allowed disclosure of private repository contents via the Copilot pull request diff summary endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
A missing authorization vulnerability was identified in GitHub Enterprise Server that allowed an authenticated user to read source code from private repositories they did not have access to. The Copilot pull request description diff summary endpoint accepted a cross-repository comparison range and rendered the resulting diff without verifying that the requesting user was authorized to view the target repository. Exploitation required an authenticated account on the instance with read access to at least one repository to use as the comparison base. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.21 and was fixed in versions 3.17.17, 3.18.11, 3.19.8, and 3.20.4. 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:L/UI:N/VC:H/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 3.21之前版本存在授权问题漏洞，该漏洞源于授权缺失，可能导致经过身份认证的用户通过Copilot pull request description diff summary端点读取其无权访问的私有代码库中的源代码。
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 ~ 3.17.16 -

II. Public POCs for CVE-2026-9132

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III. Intelligence Information for CVE-2026-9132

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Same Patch Batch · GitHub · 2026-06-30 · 3 CVEs total

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CVE-2026-10585 Stored cross-site scripting vulnerability in GitHub Enterprise Server allowed arbitrary Ja

IV. Related Vulnerabilities

Same product: Enterprise Server
Same vendor: GitHub
Same weakness: CWE-862

V. Comments for CVE-2026-9132

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