Authorization bypass 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-639.
Summary
An authorization bypass vulnerability was identified in GitHub Enterprise Server that allowed any authenticated user of the instance to read the raw diff or patch of pull requests in private repositories without authorization. Access tokens for raw pull request diffs and patches were scoped to the repository name and pull request number rather than to a globally unique repository identifier, so an attacker who created a repository and pull request matching a target's repository name and pull request number could use a token for their own repository to retrieve the private pull request's contents. Exploitation required the attacker to know the target repository's name and a valid pull request number. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.22 and was fixed in versions 3.17.21, 3.18.15, 3.19.12, 3.20.8, and 3.21.6. 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 and later; 3.18.0 and later; 3.19.0 and later; 3.20.0 and later; 3.21.0 and later | — | No fix listed | CNA |
- Enterprise Server VendorGitHub Affected 3.17.0 and later; 3.18.0 and later; 3.19.0 and later; 3.20.0 and later; 3.21.0 and later Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* | 3.17.0 to before 3.17.21; 3.18.0 to before 3.18.15; 3.19.0 to before 3.19.12; 3.20.0 to before 3.20.8; 3.21.0 to before 3.21.6 | Vulnerable | GitHub |
- cpe:2.3:a:github:enterprise_server:*:*:*:*:*:*:*:* Versions 3.17.0 to before 3.17.21; 3.18.0 to before 3.18.15; 3.19.0 to before 3.19.12; 3.20.0 to before 3.20.8; 3.21.0 to before 3.21.6 Vulnerable ·GitHub
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-75101
- 2026-10-03 Alias added: GHSA-843p-hf47-6r9f
References
Advisory 5
- https://docs.github.com/en/[email protected]/admin/release-notes#3.17.21
- https://docs.github.com/en/[email protected]/admin/release-notes#3.18.15
- https://docs.github.com/en/[email protected]/admin/release-notes#3.19.12
- https://docs.github.com/en/[email protected]/admin/release-notes#3.20.8
- https://docs.github.com/en/[email protected]/admin/release-notes#3.21.6
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-2026-75101 · CVE Program
- CVE-2026-75101 · NVD
- FIRST EPSS
- GHSA-843p-hf47-6r9f · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences