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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Github | Enterprise Server | < 3.17.17 |
Related Weaknesses (CWE)
References
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17-feRelease Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11-feRelease Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8-feaRelease Notes
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4-feaRelease Notes
FAQ
What is CVE-2026-9132?
CVE-2026-9132 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 Co...
How severe is CVE-2026-9132?
CVE-2026-9132 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-9132?
Check the references section above for vendor advisories and patch information. Affected products include: Github Enterprise Server.