Vulnerability · Published Aug 26, 2025 · Assigned by GitHub_P
CVE-2025-8447Incorrect authorization vulnerability was identified in GitHub Enterprise Server that allowed read-only access
High 7.0
In plain English
A high-severity authorization bypass via user-controlled key in Enterprise Server from GitHub. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Official description
An improper access control vulnerability was identified in GitHub Enterprise Server that allowed users with access to any repository to retrieve limited code content from another repository by creating a diff between the repositories. To exploit this vulnerability, an attacker needed to know the name of a private repository along with its branches, tags, or commit SHAs that they could use to trigger compare/diff functionality and retrieve limited code without proper authorization. This vulnerability affected all versions of GitHub Enterprise Server prior to 3.18, and was fixed in versions 3.14.17, 3.15.12, 3.16.8 and 3.17.5. This vulnerability was reported via the GitHub Bug Bounty program.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| GitHub | Enterprise Server | 3.14 – through 3.14.163.15 – through 3.15.113.16 – through 3.16.73.17 – through 3.17.4 |
Weakness: CWE-639 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N
References
- https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.17
- https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.12
- https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.8
- https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.5