CVE-2025-8447

low-risk
Published 2025-08-26

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.

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
3
CVSS 3.1/10 Low
NETWORK / HIGH complexity

Affected Products (1)

Affected Vendors

Github

References (4)

Release Notes https://docs.github.com/en/enterprise-server@3.14/admin/release-notes#3.14.17
Release Notes https://docs.github.com/en/enterprise-server@3.15/admin/release-notes#3.15.12
Release Notes https://docs.github.com/en/enterprise-server@3.16/admin/release-notes#3.16.8
Release Notes https://docs.github.com/en/enterprise-server@3.17/admin/release-notes#3.17.5
16
/ 100
low-risk
Severity 11/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal