Missing authorization in GitHub Enterprise Server
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| GitHub | Enterprise Server | 3.17.0 – 3.17.16; 3.18.0 – 3.18.10; 3.19.0 – 3.19.7; 3.20.0 – 3.20.3 | — | No fix listed | CNA |
- Enterprise Server VendorGitHub Affected 3.17.0 – 3.17.16; 3.18.0 – 3.18.10; 3.19.0 – 3.19.7; 3.20.0 – 3.20.3 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* | before 3.17.17; 3.18.0 to before 3.18.11; 3.19.0 to before 3.19.8; 3.20.0 to before 3.20.4 | Vulnerable | GitHub |
- cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions before 3.17.17; 3.18.0 to before 3.18.11; 3.19.0 to before 3.19.8; 3.20.0 to before 3.20.4 Vulnerable ·GitHub
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-9132
- 2026-10-03 Alias added: GHSA-42pg-j2h8-h5fw
References
Other 4
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.17-features
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.11-features
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.8-features
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.4-features
More GitHub Enterprise Server vulnerabilities
- TI-2024-04632 An authentication bypass vulnerability was present in the GitHub Enterprise Server (GHES)… CVSS 4.0CRITICAL 10.0
- TI-2024-00181 Unsafe Reflection in Github Enterprise Server leading to Command Injection CVSS 3.1CRITICAL 9.8
- TI-2024-00466 Privilege Escalation by Code Injection in the Management Console in GitHub Enterprise Server CVSS 3.1HIGH 8.8
- TI-2026-03340 Remote code execution via git push option injection in GitHub Enterprise Server CVSS 4.0HIGH 8.7
- TI-2024-08804 Improper signature verification in GitHub Enterprise Server CVSS 4.0CRITICAL 9.5
- TI-2026-08177 Server-side request forgery in GitHub Enterprise Server CVSS 4.0CRITICAL 9.2
Sources
- CVE-2026-9132 · CVE Program
- CVE-2026-9132 · NVD
- FIRST EPSS
- GHSA-42pg-j2h8-h5fw · GitHub Advisory Database · CC BY 4.0
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